Paricutin Test 2 Ch.4-8

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_______ magma is the most abundant type erupted at oceanic spreading centers.
- Pegmatitic
- Basaltic
- Rhyolitic
- Granitic

About This Quiz

If you fancy yourself a geology fanatic and are up to answering specifically designed questions that gauge your knowledge on Paricutin, try out this quiz. It is a simple set of questions therefore it will be easy to answer.

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2.

________ is the most common type of chemical sedimentary rock.
- Limestone
- Sandstone
- Chert
- Phosphate rock
Correct Answer

A. Limestone

Explanation

Limestone is the most common type of chemical sedimentary rock because it is formed from the accumulation of the remains of marine organisms such as coral, shells, and algae. These organisms contain calcium carbonate, which precipitates out of the water and forms limestone over time. Limestone is widely found in various parts of the world and is used for construction, as a raw material in cement production, and in the manufacturing of lime and other industrial products.

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3.

Glassy igneous rocks form when the magma ________.
- Cools so fast that mineral grains cannot crystallize and grow
- Cools so slowly that only one mineral is formed
- Is a rhyolitic type
- Cools at an extremely high temperature
Correct Answer

A. Cools so fast that mineral grains cannot crystallize and grow

Explanation

Glassy igneous rocks form when the magma cools so fast that mineral grains cannot crystallize and grow. This rapid cooling prevents the atoms in the magma from arranging themselves into an ordered crystalline structure, resulting in an amorphous, glass-like texture. Without sufficient time for crystal growth, the magma solidifies into a glassy rock. This process commonly occurs when magma is rapidly quenched by water or air, such as during volcanic eruptions or when magma is quickly injected into cooler rocks.

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4.

Which type of basaltic lava has a fairly smooth, unfragmented ropey surface?
- Aa
- Scoria
- Pahoehoe
- Pegmatitic
Correct Answer

A. Pahoehoe

Explanation

Pahoehoe is a type of basaltic lava that has a fairly smooth, unfragmented, and ropey surface. This type of lava flows slowly and forms a smooth, undulating surface as it cools and solidifies. The lava's low viscosity allows it to flow easily, creating a characteristic ropy texture. Pahoehoe lava flows are commonly found in volcanic areas such as Hawaii and Iceland.

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5.

What two factors speed up rates of chemical reaction and weathering in rocks and soils?
- Low temps; very dry
- Warm temps; vert moist
- Low temps; very moist
- High temps; very dry
Correct Answer

A. Warm temps; vert moist

Explanation

Warm temperatures and very moist conditions can speed up rates of chemical reactions and weathering in rocks and soils. Higher temperatures increase the kinetic energy of molecules, leading to faster reaction rates. Moisture provides the necessary medium for chemical reactions to occur and facilitates the breakdown of rocks and minerals. Together, warm temperatures and high moisture levels create optimal conditions for chemical reactions and weathering processes to occur at an accelerated rate.

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6.

____________ is a major dissolved volatile constituent in both magmas and volcanic gases?
- Water
- Carbon monoxide
- Hydrogen chloride
- Methane
Correct Answer

A. Water

Explanation

Water is a major dissolved volatile constituent in both magmas and volcanic gases. It is commonly found in magma and volcanic gases due to the presence of water-rich minerals in the Earth's crust. When these minerals melt during volcanic activity, the water is released and becomes dissolved in the magma. As the magma rises to the surface and erupts, the water vaporizes and is released into the atmosphere as volcanic gases. Water plays a crucial role in volcanic processes, influencing the viscosity and eruptive behavior of magmas. It also contributes to the formation of volcanic clouds and can trigger explosive eruptions when it rapidly expands and turns into steam.

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7.

What volcanic events formed Crater Lake, OR? When did it happen?
- The crater of a large, extinct cinder cone filled with water; 5 million years ago
- Caldera collapse followed major ash and pyroclastic-flow eruptions; 6,000 years ago
- Landslides and volcanic mudflows dammed the Mazama River; 500 years ago
- A powerful explosion blew away the top of a stratovolcano: 10 million years ago
Correct Answer

A. Caldera collapse followed major ash and pyroclastic-flow eruptions; 6,000 years ago

Explanation

Crater Lake, OR was formed by a caldera collapse, which was followed by major ash and pyroclastic-flow eruptions. This event occurred approximately 6,000 years ago.

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8.

The Columbia Plateau in Washington and Oregon is_______.
- A thick stack of welded-tuff layers
- A field of large stratovolcanoes
- A flood basalt plateau
- A caldera filled with rhyolitic lava flows
Correct Answer

A. A flood basalt plateau

Explanation

The Columbia Plateau in Washington and Oregon is a flood basalt plateau. This means that it was formed by repeated volcanic eruptions that deposited layers of basaltic lava over a large area. The lava flows were extensive and covered a significant portion of the landscape, creating a flat and elevated plateau. This type of volcanic activity is commonly associated with hotspot volcanism, where a stationary mantle plume causes repeated eruptions over a long period of time. The Columbia Plateau is a prime example of this type of volcanic activity and is characterized by its extensive basaltic lava flows.

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9.

Why does “an increase in” minerals that did not exist in the “parent rock” form during metamorphism of a rock (e.g., garnet in schist)?
- No T and P conditions cause spontaneous weathering and destruction of the rock’s minerals, giving way to new ones
- An increase in T and P conditions cause a change in the stability in the rock’s minerals
- Similar” T and P conditions cause no change in the stability in the rock’s minerals
- Any of these
Correct Answer

A. An increase in T and P conditions cause a change in the stability in the rock’s minerals

Explanation

An increase in temperature and pressure conditions can cause a change in the stability of minerals in the rock. This change in stability can lead to the formation of new minerals that did not exist in the parent rock during metamorphism. The increased temperature and pressure conditions can alter the chemical composition and structure of the minerals, leading to the formation of new minerals such as garnet in schist.

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10.

Which response lists the rocks in increasing grade of metamorphism?
- Schist, slate, phyllite, gneiss
- Phyllite, gneiss, slate, schist
- Gneiss, slate, schist, phyllite
- Slate, phyllite, schist, gneiss
Correct Answer

A. Slate, phyllite, schist, gneiss

Explanation

The correct answer is "Slate, phyllite, schist, gneiss." This order represents an increasing grade of metamorphism, with slate being the least metamorphosed and gneiss being the most metamorphosed.

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11.

Frost wedging is the major weathering process contributing to the formation of which regolith material?
- Mature pedalfers
- Talus slopes
- C soil horizons
- Tropical laterites
Correct Answer

A. Talus slopes

Explanation

Frost wedging is a weathering process that occurs when water freezes and expands in cracks and crevices of rocks, causing them to break apart. This process is particularly effective in regions with freezing and thawing cycles, such as mountainous areas. Talus slopes are formed by the accumulation of broken rock fragments at the base of steep slopes or cliffs, which are often the result of frost wedging. Therefore, talus slopes are the regolith material that is most likely formed by the major weathering process of frost wedging.

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12.

What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it?
- Law of superposition
- Theory of correlative deposition
- Theory of supersition
- Law or original correleation
Correct Answer

A. Law of superposition

Explanation

The law of superposition states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it. This means that as sedimentary layers are deposited over time, the older layers are found at the bottom while the younger layers are found towards the top. This principle is based on the assumption that undisturbed layers of sedimentary rocks are deposited in a chronological order, with the oldest rocks at the bottom and the youngest rocks at the top. It is a fundamental concept in geology used to determine the relative ages of rock layers and the fossils they contain.

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13.

____ refers to the process of fossilization where the internal cavities and pores of the original organism are filled with precipitated mineral matter.
- Carbonization
- Replacement
- Petrification
- Impression
Correct Answer

A. Petrification

Explanation

Petrification refers to the process of fossilization where the internal cavities and pores of the original organism are filled with precipitated mineral matter. This process occurs when the organic material of the organism is gradually replaced by minerals such as silica or calcite, resulting in a stone-like fossil. It is different from carbonization, which involves the preservation of the organism's carbon residue, replacement, which involves the complete substitution of the original material with minerals, and impression, which involves the preservation of an imprint or mold of the organism.

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14.

In terrain with steep hill slopes, which crop and cultivation technique will minimize soil erosion?
- Corn; rows trending straight down the slope, frequent cultivation.
- Apples; land between the trees is planted in grass and not cultivated.
- Winter wheat; after the harvest, the field is plowed and left idle until next fall.
- Beans; rows are spaced wider than on a level field.
Correct Answer

A. Apples; land between the trees is planted in grass and not cultivated.

Explanation

Planting grass between the apple trees and not cultivating it helps to minimize soil erosion in terrain with steep hill slopes. The grass acts as a protective cover, reducing the impact of rainfall and preventing the soil from being washed away. Cultivating the land between the trees would disturb the soil and make it more prone to erosion. By keeping the land planted in grass, the soil is held in place, reducing erosion and preserving its fertility.

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15.

During metamorphism, what is the major effect of chemically active fluids?
- Increase the pressures in deeply buried, regional-metamorphic zones
- Aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grains
- Prevent partial melting so solid rocks can undergo very high temperature regional metamorphism
- Facilitate the formation of schistosity and gneissic banding in hornfels and slates
Correct Answer

A. Aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grains

Explanation

Chemically active fluids during metamorphism aid in the movement of dissolved silicate constituents and facilitate the growth of mineral grains. These fluids contain dissolved ions and molecules that can migrate through the rock, allowing for the rearrangement and recrystallization of minerals. This process helps in the formation of new minerals and the growth of existing ones, leading to the development of distinct textures and structures in metamorphic rocks.

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16.

Which of the following best describes sets of fractures in relatively fresh bedrock, such as granite, that are roughly parallel to the land surface?
- Hydrolytic failures
- Columnar joints
- Thermal
- Sheeting fractures
Correct Answer

A. Sheeting fractures

Explanation

Sheeting fractures best describe sets of fractures in relatively fresh bedrock, such as granite, that are roughly parallel to the land surface. Sheeting fractures occur due to the release of confining pressure on the rock surface, causing it to expand and crack parallel to the surface. These fractures often result in the formation of curved or domed rock slabs, resembling the layers of an onion.

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17.

As the rate of cooling increases, the size of the crystals that form __________.
- increases
- decreases
- Is not affected
- None of these
Correct Answer

A. decreases

Explanation

As the rate of cooling increases, the size of the crystals that form decreases. This is because when a substance cools rapidly, the molecules do not have enough time to arrange themselves in an orderly manner, resulting in smaller crystal formations. On the other hand, slower cooling allows the molecules to arrange themselves more uniformly, leading to larger crystal formations. Therefore, increasing the rate of cooling will cause a decrease in crystal size.

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18.

Which of the following is associated with deep mantle hot spots?
- Vesuvius and the other volcanoes of Italy
- The volcanoes of Hawaii and Yellowstone National Park
- The very young cinder cones scattered across the southwestern United States
- Mt. St. Helens and other volcanoes of the Cascade Mountains
Correct Answer

A. The volcanoes of Hawaii and Yellowstone National Park

Explanation

Deep mantle hot spots are associated with the volcanoes of Hawaii and Yellowstone National Park. This is because these locations have a high concentration of volcanic activity and are known for their geothermal features. The hot spots in these areas are believed to be caused by plumes of hot material rising from deep within the Earth's mantle. This molten material then breaks through the Earth's crust, resulting in volcanic eruptions and the formation of unique landforms such as geysers and lava flows.

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19.

Which of the following rocks is likely to have the most quartz within it and why?
- Granite; intrusive rock that formed from cooling of relatively high silica magma.
- Rhyolite; extrusive rock that formed from cooling of relatively low silica magma.
- Diorite; intrusive rock that formed from the cooling of relatively intermediate silica magma.
- Basalt; extrusive rock that formed from cooling of relatively low silica lava.
Correct Answer

A. Granite; intrusive rock that formed from cooling of relatively high silica magma.

Explanation

Granite is likely to have the most quartz within it because it is an intrusive rock that formed from the cooling of relatively high silica magma. Silica is the main component of quartz, so a rock with high silica content is more likely to contain a higher amount of quartz. In contrast, the other rocks mentioned have lower silica content, which means they are less likely to have as much quartz.

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20.

Igneous rocks are produced largely by ________.
- The changing of a rock from one set of minerals to another
- The compaction of metamorphic rocks
- The melting of sedimentary rocks
- The cooling of magma
- Both c and d are correct.
Correct Answer

A. The cooling of magma

Explanation

Igneous rocks are formed through the cooling of magma, which is molten rock beneath the Earth's surface. As the magma cools, it solidifies and forms igneous rocks. This process can occur both beneath the Earth's surface, forming intrusive igneous rocks, or on the surface, forming extrusive igneous rocks. The other options mentioned, such as the changing of minerals in a rock, the compaction of metamorphic rocks, or the melting of sedimentary rocks, are not directly related to the formation of igneous rocks.

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21.

What do pumice and obsidian have in common?
- Basaltic composition
- Phaneritic texture
- Ultramafic compostion
- Glassy texture
Correct Answer

A. Glassy texture

Explanation

Pumice and obsidian both have a glassy texture. This means that they have a smooth and shiny appearance, similar to glass. The glassy texture is formed when the molten lava cools rapidly, preventing the formation of any crystalline structures. As a result, both pumice and obsidian have an amorphous structure, which gives them their characteristic glass-like texture.

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22.

A_______ is a intrusive, igneous rock body that is tabular and concordant.
- Dike
- Stock
- Batholith
- Sill
Correct Answer

A. Sill

Explanation

A sill is an intrusive, igneous rock body that is tabular and concordant. It is formed when magma is injected between layers of existing rock and solidifies horizontally. Sills are usually parallel to the layers of surrounding rock and do not cut across them. This distinguishes them from dikes, which are similar intrusive rock bodies but are discordant, cutting across the layers of existing rock. Sills are often found in areas of volcanic activity and can be seen exposed in cliffs or mountainsides.

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23.

Sedimentary rocks compose approximately _______ percent of Earth's outermost 10 miles.
- 5%
- 15%
- 30%
- 50%
Correct Answer

A. 5%

Explanation

Sedimentary rocks make up only a small fraction of Earth's outermost 10 miles, accounting for approximately 5% of the composition. These rocks are formed from the accumulation and consolidation of sediments, such as sand, mud, and organic matter, over long periods of time. The majority of Earth's outermost layer is composed of igneous and metamorphic rocks, which undergo different processes of formation.

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24.

The most violent volcanic activity is associated with __________.
- fissure eruptions
- Shield volcanoes
- Cinder cones
- Composite cones
Correct Answer

A. Composite cones

Explanation

Composite cones, also known as stratovolcanoes, are associated with the most violent volcanic activity. These volcanoes are characterized by their steep slopes, large size, and explosive eruptions. They are formed by alternating layers of lava flows and pyroclastic materials, such as ash, pumice, and volcanic bombs. The build-up of pressure from the gas-rich magma within these volcanoes leads to powerful and explosive eruptions, making them the most violent type of volcanic activity.

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25.

Paricutin is an example of a __________
- shield volcano
- Cinder cone
- Lava dome
- Volcanic neck
Correct Answer

A. Cinder cone

Explanation

Paricutin is an example of a cinder cone volcano. Cinder cone volcanoes are formed by explosive eruptions that eject volcanic ash, cinders, and lava bombs into the air. These materials then fall back to the ground and build up around the vent, forming a steep-sided cone-shaped volcano. Paricutin is a famous example of a cinder cone volcano because it grew rapidly from a cornfield in Mexico in 1943, reaching a height of over 1,300 feet in just one year.

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26.

Which are the four most important physical processes of mechanical weathering?
- Frost wedging, exfoliation, biological activity, dissolution
- Exfoliation, thermal expansion, biological activity, hydrolysis
- Exfoliation, frost wedging, expansion, hydrolysis
- Frost wedging, unloading expansion, thermal expansion, biological activity
Correct Answer

A. Frost wedging, unloading expansion, thermal expansion, biological activity

Explanation

The correct answer is frost wedging, unloading expansion, thermal expansion, biological activity. Frost wedging is the process where water freezes and expands in cracks, causing them to widen. Unloading expansion occurs when overlying pressure on rocks is removed, causing them to expand and crack. Thermal expansion is the process where rocks expand and contract due to temperature changes, leading to cracking. Biological activity involves the actions of plants and animals that can break apart rocks through root growth, burrowing, or other activities. These four processes are important in mechanical weathering as they contribute to the physical breakdown of rocks.

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27.

Which statement concerning mechanical weathering is NOT true?
- Reduces the grain sizes of rock particles
- Allows for faster rates of chemical weathering
- Is important in the formation of talus slopes
- Involves a change in the mineral composition of the weathered material
Correct Answer

A. Involves a change in the mineral composition of the weathered material

Explanation

Mechanical weathering refers to the physical breakdown of rocks into smaller fragments without any change in their chemical composition. It does not involve a change in the mineral composition of the weathered material. The other statements are true. Mechanical weathering reduces the grain sizes of rock particles, which in turn allows for faster rates of chemical weathering. It is also important in the formation of talus slopes, which are created by the accumulation of rock debris at the base of a slope due to gravity.

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28.

Why would a plume of solid silicate rock rising slowly from deep in the mantle begin melting as it neared the base of the lithosphere?
- The rock heats up and expands at lower pressures, causing it to liquefy.
- Temperatures remain high as lowered pressures decrease melting temperatures.
- The lowered pressures cause rapid heat loss accompanied by melting.
- None of the above.
Correct Answer

A. Temperatures remain high as lowered pressures decrease melting temperatures.

Explanation

As the solid silicate rock rises from deep in the mantle to the base of the lithosphere, it experiences a decrease in pressure. This decrease in pressure lowers the melting temperature of the rock, allowing it to begin melting. However, the temperatures remain high due to the heat generated from the mantle. Therefore, the combination of lowered pressures and high temperatures causes the rock to melt as it nears the base of the lithosphere.

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29.

Why do magmas rise toward Earth's surface?
- Magmas are more viscous than solid rocks in the crust and upper mantle.
- Most magmas are richer in silica than most crustal and upper mantle rocks.
- Magmas are mainly liquid and contain dissolved fluids and gases such as water; most are less dense than the adjacent solid rock.
- All of the above.
Correct Answer

A. Magmas are mainly liquid and contain dissolved fluids and gases such as water; most are less dense than the adjacent solid rock.

Explanation

Magmas rise toward Earth's surface because they are mainly liquid and contain dissolved fluids and gases such as water. Additionally, most magmas are less dense than the adjacent solid rock. This buoyancy causes the magmas to ascend towards the surface, where they can erupt as volcanic activity. The other options, such as magmas being more viscous than solid rocks and richer in silica, do not directly explain the upward movement of magmas.

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30.

The 1991 Pinatubo eruption in the Philippines caused brilliantly colored sunrises and sunsets to be seen for the next few years. What caused this phenomenon?
- The eruption added large amounts of carbon dioxide to the atmosphere.
- The eruptive cloud destroyed parts of the Earth's protective ozone layer.
- Radioactive atoms blown into the atmosphere glowed red as they decayed.
- Sulfur dioxide and other erupted gases formed aerosols in the stratosphere.
Correct Answer

A. Sulfur dioxide and other erupted gases formed aerosols in the stratosphere.

Explanation

The correct answer is that sulfur dioxide and other erupted gases formed aerosols in the stratosphere. During the Pinatubo eruption, large amounts of sulfur dioxide were released into the atmosphere. These sulfur dioxide gases reacted with water vapor and other chemicals to form tiny particles called aerosols. These aerosols were then distributed throughout the stratosphere by wind patterns. When sunlight passed through the stratosphere, it interacted with the aerosols, scattering and filtering the light. This scattering of light caused the stunning and vibrant colors in sunrises and sunsets that were observed for several years after the eruption.

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31.

A________ forms at very high pressures and moderately low temperatures associated with subduction of oceanic crust and sediments.
- Biotite marble
- Blueschist
- Migmatite
- Mylonite
Correct Answer

A. Blueschist

Explanation

Blueschist forms at high pressures and relatively low temperatures during the subduction of oceanic crust and sediments. This metamorphic rock is characterized by its blue color, which is caused by the presence of the mineral glaucophane. The high pressure and low temperature conditions of subduction zones cause the mineral assemblage in the rock to change, resulting in the formation of blueschist. This rock type is commonly found in regions where tectonic plates converge and oceanic crust is being subducted beneath continental crust.

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32.

What term describes the zone of contact metamorphism surrounding an intrusive magma body?
- Aureole
- Oracle
- Auricle
- Aura
Correct Answer

A. Aureole

Explanation

The term that describes the zone of contact metamorphism surrounding an intrusive magma body is "aureole." This term is commonly used in geology to refer to the area where the surrounding rocks are altered and metamorphosed due to the heat and fluids released by the intrusive magma body. The aureole is typically characterized by the formation of new minerals and changes in the texture and composition of the rocks.

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33.

____, a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.
- Biotite
- Calcite
- Quartz
- Orthoclase
Correct Answer

A. Quartz

Explanation

Quartz is the correct answer because it is a common mineral found in igneous rocks and is also the most abundant mineral in detrital sedimentary rocks. This means that quartz is frequently weathered and eroded from igneous rocks and then transported and deposited as sediment, making it the dominant mineral in detrital sedimentary rocks. Biotite, calcite, and orthoclase are also minerals found in igneous rocks, but they are not as abundant in detrital sedimentary rocks as quartz.

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34.

Kilauea is an example of a __________.
- shield volcano
- Cinder cone
- Lava dome
- Volcanic neck
Correct Answer

A. shield volcano

Explanation

Kilauea is an example of a shield volcano because it is a broad, gently sloping volcano formed by the accumulation of low-viscosity basaltic lava flows. Shield volcanoes are characterized by their large size, low profile, and the ability of lava to flow easily and cover a wide area. Kilauea, located in Hawaii, is one of the most active volcanoes in the world and is known for its frequent eruptions of basaltic lava. The other options, cinder cone, lava dome, and volcanic neck, do not accurately describe the characteristics of Kilauea.

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35.

How do you classify sedimentary rocks?
- Grain size and cooling rate
- Color and amount of silica
- Texture and grain size
- Texture and composition
- None of the above
Correct Answer

A. Texture and grain size

Explanation

Sedimentary rocks are classified based on their texture and grain size. Texture refers to the arrangement and size of the grains within the rock, while grain size refers to the size of the individual grains. These characteristics provide information about the conditions under which the rock was formed, such as the energy of the environment and the distance of transport. By examining the texture and grain size, geologists can determine the type and origin of the sedimentary rock.

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36.

Lava flows are typically finer grained than intrusive igneous rocks. Why?
- Intrusive magma is cooler because it is well insulated by the surrounding rock.
- Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow.
- The extrusive magma cools quickly so the mineral grains do not have time to grow.
- The extrusive magma, because it is deep below the surface, cools very slowly, producing very small mineral grains.
Correct Answer

A. The extrusive magma cools quickly so the mineral grains do not have time to grow.

Explanation

Lava flows are typically finer grained than intrusive igneous rocks because extrusive magma cools quickly when it reaches the Earth's surface. This rapid cooling does not allow enough time for large mineral grains to form, resulting in a finer-grained texture. In contrast, intrusive magma is insulated by the surrounding rock, which causes it to cool more slowly. The slower cooling process allows for the growth of many small mineral grains, leading to a coarser-grained texture in intrusive igneous rocks.

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37.

What does Bowen’s Reaction Series describe?
- The pressures that different minerals are formed in metamorphic rocks
- Which minerals are recrystallized in a sedimentary rock
- The temperatures at which different minerals crystallize out of a melt
- All of the above
- None of the above
Correct Answer

A. The temperatures at which different minerals crystallize out of a melt

Explanation

Bowen's Reaction Series describes the temperatures at which different minerals crystallize out of a melt. This series explains the order in which minerals solidify as a melt cools, starting with high-temperature minerals and ending with low-temperature minerals. It is a useful tool in understanding the formation of igneous rocks and the mineral composition of these rocks based on their cooling history. The other options mentioned, such as the pressures in metamorphic rocks or the recrystallization of minerals in sedimentary rocks, are not directly related to Bowen's Reaction Series.

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38.

Which of the following igneous rocks exhibit aphanitic texture?
- Granite; gabbro
- Rhyolite, gabbro
- Andesite; rhyolite
- Basalt; diorite
Correct Answer

A. Andesite; rhyolite

Explanation

Andesite and rhyolite are the igneous rocks that exhibit aphanitic texture. Aphanitic texture refers to fine-grained rocks that have crystals too small to be seen with the naked eye. Andesite and rhyolite both cool relatively quickly on or near the Earth's surface, which prevents large crystals from forming. This rapid cooling results in a fine-grained texture. Granite, gabbro, basalt, and diorite, on the other hand, are examples of rocks with phaneritic texture, which means they have visible crystals due to slower cooling deep within the Earth's crust.

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39.

Why is the humus layer typically thicker in a cool, temperate, forest soil than in a tropical rainforest soil?
- Less humus is produced in the tropical rainforest because the B horizon is so poorly developed.
- Less humus is produced in the cool, temperate forest but the rate of decay and oxidation is slower than in a tropical rainforest.
- More humus is produced in the tropical rainforest, but it is quickly washed away by the heavy rains.
- In a tropical rainforest, the forest-floor litter is often burned during the dry season.
Correct Answer

A. Less humus is produced in the cool, temperate forest but the rate of decay and oxidation is slower than in a tropical rainforest.

Explanation

In a cool, temperate forest soil, the humus layer is typically thicker because although less humus is produced compared to a tropical rainforest, the rate of decay and oxidation is slower. This means that the organic matter in the soil takes longer to break down, leading to a buildup of humus over time. In contrast, in a tropical rainforest, more humus may be produced, but it is quickly washed away by the heavy rains, preventing a significant accumulation of humus in the soil.

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40.

Which are sedimentary rocks?
- Shale and slate
- Granite and limestone
- Schist and sandstone
- Conglomerate and mudstone
- Phyllite and siltstone
Correct Answer

A. Conglomerate and mudstone

Explanation

Conglomerate and mudstone are sedimentary rocks because they are formed from the accumulation and compaction of sediments. Conglomerate is composed of rounded pebbles, cobbles, and boulders that have been cemented together, while mudstone is made up of fine-grained sediment particles, such as silt and clay, that have been compacted over time. Both rocks are examples of sedimentary rocks that have undergone the processes of lithification, which involve the transformation of loose sediments into solid rock through pressure and cementation.

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41.

Oolitic limestone is most likely to form in what type of depositional environment?
- Quiet, muddy lagoons and bays
- Shallow, clear marine waters with vigorous current activity
- Deep marine waters below most wave action
- Acidic, organic-rich waters in freshwater swamps and bogs
Correct Answer

A. Shallow, clear marine waters with vigorous current activity

Explanation

Oolitic limestone is a type of limestone composed of small spherical grains called ooids. These ooids are formed by the precipitation of calcium carbonate in shallow, clear marine waters with vigorous current activity. The vigorous currents help to constantly agitate and roll the ooids, allowing them to grow layer by layer and form the oolitic limestone. In deeper marine waters, there is less wave action and current activity, making it less likely for oolitic limestone to form. The other options, such as quiet muddy lagoons and bays or acidic freshwater swamps and bogs, do not provide the necessary conditions for the formation of oolitic limestone.

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42.

Which sedimentary rock consists of clay and fine silt size particles?
- Sandstone
- Shale
- Conglomerate
- Breccia
Correct Answer

A. Shale

Explanation

Shale is the correct answer because it is a sedimentary rock that is composed of clay and fine silt size particles. Shale is formed from the compaction and cementation of these small particles over time. It has a fine-grained texture and is often characterized by its ability to split into thin layers.

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43.

Assuming that water filling a crack in a rock undergoes cycles of freezing and melting. Which of the following statements is true?
- Water expands as it melts, causing the crack walls to be pushed apart
- Water expands as it freezes, causing the crack walls to be pushed apart
- Water shrinks as it melts, causing the crack walls to be pulled closer together
- Water shrinks as it freezes, causing the crack walls to be drawn closer together
Correct Answer

A. Water expands as it freezes, causing the crack walls to be pushed apart

Explanation

Water expands as it freezes because the molecules in water arrange themselves in a hexagonal lattice structure when frozen, which takes up more space than when they are in a liquid state. This expansion exerts pressure on the crack walls, causing them to be pushed apart.

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44.

In the Rocky Mountain region of the United States, north-facing slopes (downhill direction is toward the north) are typically more moist and heavily forested than south-facing slopes. Why?
- North-facing slopes receive more sunlight in the summer; snow melts faster and more soil moisture is available for the trees.
- South-facing slopes receive more moisture and sunlight; rock weathering is slower.
- North-facing slopes receive about the same amount of precipitation as south-facing slopes; less moisture evaporates from north-facing slopes.
- South-facing slopes receive less moisture, yet rock weathering is faster.
Correct Answer

A. North-facing slopes receive about the same amount of precipitation as south-facing slopes; less moisture evaporates from north-facing slopes.

Explanation

North-facing slopes receive about the same amount of precipitation as south-facing slopes, but less moisture evaporates from north-facing slopes. This means that the moisture on north-facing slopes is retained for a longer period of time, resulting in a higher level of soil moisture. Additionally, the lack of direct sunlight on north-facing slopes leads to slower evaporation, further contributing to the moist environment. These conditions are favorable for the growth of forests, explaining why north-facing slopes in the Rocky Mountain region are typically more moist and heavily forested than south-facing slopes.

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45.

____ forms from the metamorphism of limestone or dolostone
- Quartzite
- Marble
- Migmatite
- Amphibolite
Correct Answer

A. Marble

Explanation

Marble forms from the metamorphism of limestone or dolostone. During metamorphism, the heat and pressure cause the minerals in the limestone or dolostone to recrystallize, resulting in the formation of marble. Marble is a metamorphic rock that is characterized by its smooth and polished appearance, and it is commonly used in construction and sculpture due to its aesthetic qualities.

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46.

What is the most important factor for whether magma cools slowly or quickly?
- Temperature of the environment – lower T = slower magma cooling.
- The presence or absence of volatiles (gases) – more gases = slower magma cooling.
- Temperature of the environment – higher T = slower magma cooling.
- Pressure of the environment – lower P = slower magma cooling.
Correct Answer

A. Temperature of the environment – higher T = slower magma cooling.

Explanation

The most important factor for whether magma cools slowly or quickly is the temperature of the environment. When the temperature of the environment is higher, magma cools at a slower rate. This is because higher temperatures provide more energy to the magma, preventing it from cooling down quickly. On the other hand, lower temperatures in the environment would result in faster cooling of the magma.

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47.

Which of the following sedimentary rocks would you expect to have originally been deposited by fast-moving streams?
- Mudstone
- Oolitic limestone
- Graywacke
- Conglomerate
Correct Answer

A. Conglomerate

Explanation

Conglomerate is the correct answer because it is a type of sedimentary rock that consists of rounded gravel-sized particles called clasts. These clasts are typically cemented together by a matrix of finer particles. Conglomerate forms in environments with fast-moving streams or rivers, where the force of the water is strong enough to transport and deposit larger particles. Therefore, conglomerate is indicative of deposition by fast-moving streams.

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48.

Detrital grains of which minerals are extremely rare in detrital sediments? Why?
- Clays; they are rare in soils and regoliths
- Quartz; it is very hard and soluble
- Feldspar; they occur only in granites
- Calcites; it is soft and relatively soluble
Correct Answer

A. Calcites; it is soft and relatively soluble

Explanation

Calcite minerals are extremely rare in detrital sediments because they are soft and relatively soluble. Being soft makes them more prone to weathering and erosion, causing them to break down into smaller particles and dissolve more easily. As a result, calcite grains are less likely to survive the transport and deposition processes that form detrital sediments. This is why they are rarely found in detrital sediments compared to other minerals like clays, quartz, and feldspar.

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49.

Which best describes the “soil profile” and its relevance to weathering?
- Soil-forming processes occur from the bottom-up. This causes vertical variations in soil composition, texture, structure, and color.
- Soil-forming processes occur from top-down. This causes vertical variations in soil composition, texture, structure, and color.
- Soil-forming processes occur in single layers at a time. This causes each layer to appear differently in composition, texture, structure, and color.
- Soil-forming processes occur laterally in the same layer, so different vertical profiles allows geologists to determine that variation from place to place.
Correct Answer

A. Soil-forming processes occur from top-down. This causes vertical variations in soil composition, texture, structure, and color.

Explanation

The correct answer is that soil-forming processes occur from top-down, which causes vertical variations in soil composition, texture, structure, and color. This means that the processes that form soil start at the top and work their way down, resulting in different layers with varying characteristics. The vertical variations in soil properties are important because they can provide information about the weathering processes that have occurred over time. By studying the different layers of soil, geologists can determine how the soil has been affected by weathering and other environmental factors.

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Paricutin Test 2 Ch.4-8

_______ magma is the most abundant type erupted at oceanic spreading centers.

Quiz Preview

________ is the most common type of chemical sedimentary rock.

Glassy igneous rocks form when the magma ________.

Which type of basaltic lava has a fairly smooth, unfragmented ropey surface?

What two factors speed up rates of chemical reaction and weathering in rocks and soils?

____________ is a major dissolved volatile constituent in both magmas and volcanic gases?

What volcanic events formed Crater Lake, OR? When did it happen?

The Columbia Plateau in Washington and Oregon is_______.

Why does “an increase in” minerals that did not exist in the “parent rock” form during metamorphism of a rock (e.g., garnet in schist)?

Which response lists the rocks in increasing grade of metamorphism?

Frost wedging is the major weathering process contributing to the formation of which regolith material?

What fundamental concept states that in a horizontal sequence of conformable sedimentary strata, each higher bed is younger than the bed below it?

____ refers to the process of fossilization where the internal cavities and pores of the original organism are filled with precipitated mineral matter.

In terrain with steep hill slopes, which crop and cultivation technique will minimize soil erosion?

During metamorphism, what is the major effect of chemically active fluids?

Which of the following best describes sets of fractures in relatively fresh bedrock, such as granite, that are roughly parallel to the land surface?

As the rate of cooling increases, the size of the crystals that form __________.

Which of the following is associated with deep mantle hot spots?

Which of the following rocks is likely to have the most quartz within it and why?

Igneous rocks are produced largely by ________.

What do pumice and obsidian have in common?

A_______ is a intrusive, igneous rock body that is tabular and concordant.

Sedimentary rocks compose approximately _______ percent of Earth's outermost 10 miles.

The most violent volcanic activity is associated with __________.

Paricutin is an example of a __________

Which are the four most important physical processes of mechanical weathering?

Which statement concerning mechanical weathering is NOT true?

Why would a plume of solid silicate rock rising slowly from deep in the mantle begin melting as it neared the base of the lithosphere?

Why do magmas rise toward Earth's surface?

The 1991 Pinatubo eruption in the Philippines caused brilliantly colored sunrises and sunsets to be seen for the next few years. What caused this phenomenon?

A________ forms at very high pressures and moderately low temperatures associated with subduction of oceanic crust and sediments.

What term describes the zone of contact metamorphism surrounding an intrusive magma body?

____, a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.

Kilauea is an example of a __________.

How do you classify sedimentary rocks?

Lava flows are typically finer grained than intrusive igneous rocks. Why?

What does Bowen’s Reaction Series describe?

Which of the following igneous rocks exhibit aphanitic texture?

Why is the humus layer typically thicker in a cool, temperate, forest soil than in a tropical rainforest soil?

Which are sedimentary rocks?

Oolitic limestone is most likely to form in what type of depositional environment?

Which sedimentary rock consists of clay and fine silt size particles?

Assuming that water filling a crack in a rock undergoes cycles of freezing and melting. Which of the following statements is true?

In the Rocky Mountain region of the United States, north-facing slopes (downhill direction is toward the north) are typically more moist and heavily forested than south-facing slopes. Why?

____ forms from the metamorphism of limestone or dolostone

What is the most important factor for whether magma cools slowly or quickly?

Which of the following sedimentary rocks would you expect to have originally been deposited by fast-moving streams?

Detrital grains of which minerals are extremely rare in detrital sediments? Why?

Which best describes the “soil profile” and its relevance to weathering?