Geology Ch. 8 Test
Basically Geology is the wide study of solid earth, the rocks and how they change over time. This quiz is for those Geology enthusiasts who want to test and advance their knowledge on the subject. All the best.
Questions and Answers
- 1.
Which of the following forms at the highest grade of regional metamorphism?
- A.
Hornfels
- B.
Schist
- C.
Slate
- D.
Phyllite
Correct Answer
B. SchistExplanation
Schist forms at the highest grade of regional metamorphism because it is a medium to coarse-grained metamorphic rock that has undergone intense heat and pressure. It exhibits foliation, which is a characteristic of high-grade metamorphic rocks. Hornfels, slate, and phyllite are formed at lower grades of metamorphism and do not exhibit the same level of metamorphic changes as schist.Rate this question:
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- 2.
What platy, parallel, mineral grains are the most visual aspect of foliated metamorphic rocks?
- A.
Micas
- B.
Feldspars
- C.
Carbonates
- D.
Quartz
Correct Answer
A. MicasExplanation
Micas are the most visual aspect of foliated metamorphic rocks because they have a platy and parallel structure. This means that the mineral grains of micas are flat and aligned in parallel layers, giving the rock a characteristic foliated texture. Micas are also known for their shiny appearance and ability to split into thin sheets, which further enhances their visibility in metamorphic rocks.Rate this question:
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- 3.
What major change occurs during metamorphism of limestone to marble?
- A.
Calcite grains grow larger and increase in size
- B.
Clays crystallize to micas, forming a highly foliated, mica-rich rock
- C.
Limestone grains react to form quartz and feldspars
- D.
Calcite grains are dissolved away leaving only marble crystals
Correct Answer
A. Calcite grains grow larger and increase in sizeExplanation
During the metamorphism of limestone to marble, the major change that occurs is that the calcite grains in the limestone grow larger and increase in size. This process is known as recrystallization, where the existing calcite crystals rearrange and merge together, resulting in larger grains. This transformation gives marble its characteristic crystalline texture and increased hardness compared to limestone.Rate this question:
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- 4.
Which low-grade metamorphic rock, composed of extremely fine-sized mica and other mineral grains, typically exhibits well-developed rock cleavage?
- A.
Schist
- B.
Hornfels
- C.
Quartzite
- D.
Slate
Correct Answer
D. SlateExplanation
Slate is a low-grade metamorphic rock that is composed of extremely fine-sized mica and other mineral grains. It typically exhibits well-developed rock cleavage, which refers to the tendency of the rock to split along parallel planes. This cleavage is a result of the alignment of the mica and other mineral grains during the metamorphic process. Schist, hornfels, and quartzite are also metamorphic rocks, but they do not typically exhibit the same level of well-developed rock cleavage as slate.Rate this question:
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- 5.
Tektites originate in what metamorphic environment?
- A.
Low pressure and high temperature associated with volcanism
- B.
High temperatures associated with meteorite impacts
- C.
Very high pressures and temperatures associated with deep subduction
- D.
High temperatures and shearing stresses in an oceanic-crust transform fault
Correct Answer
B. High temperatures associated with meteorite impactsExplanation
Tektites are glassy objects that are formed when meteorites impact the Earth's surface. The high temperatures generated during these impacts cause the surrounding rocks to melt and form tektites. Therefore, the correct answer is high temperatures associated with meteorite impacts.Rate this question:
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- 6.
Which one of the following is not likely to be genetically associated with impact of an asteroid or large meteorite?
- A.
Tektites
- B.
Blueschists
- C.
Coesite
- D.
Impact crater
Correct Answer
B. BlueschistsExplanation
Blueschists are a type of high-pressure metamorphic rock formed deep within the Earth's crust. They are not likely to be genetically associated with the impact of an asteroid or large meteorite because their formation process is unrelated to such events. Tektites, coesite, and impact craters, on the other hand, are directly linked to the impact of an asteroid or large meteorite and can be used as evidence of such an event.Rate this question:
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- 7.
Which of the following statements concerning slate is not true?
- A.
Has abundant, coarse-grained mica
- B.
Forms from shales and mudstones
- C.
Rock cleavage is common
- D.
Sedimentary features may be visible
Correct Answer
A. Has abundant, coarse-grained micaExplanation
Slate is a fine-grained metamorphic rock that forms from shales and mudstones. It is characterized by its rock cleavage, which means it can be easily split into thin sheets. Sedimentary features may also be visible in slate. However, slate does not have abundant, coarse-grained mica. Mica is a common mineral found in other types of rocks like granite, but it is not typically present in large quantities in slate.Rate this question:
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- 8.
________ is a strong, parallel alignment of coarse mica flakes and/or of different mineral bands in a metamorphic rock.
- A.
Rock cleavage
- B.
Foliation
- C.
Stress streaking
- D.
Marbleizing
Correct Answer
B. FoliationExplanation
Foliation is the correct answer because it refers to the strong, parallel alignment of coarse mica flakes and/or different mineral bands in a metamorphic rock. This alignment occurs due to the intense pressure and heat during the rock's formation, causing the minerals to align in a specific direction. Foliation is a characteristic feature of metamorphic rocks and helps to distinguish them from other types of rocks.Rate this question:
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- 9.
________ is a nonfoliated rock formed by contact metamorphism of a shale or mudstone.
- A.
Schist
- B.
Marble
- C.
Gneiss
- D.
Hornfels
Correct Answer
D. HornfelsExplanation
Hornfels is a nonfoliated rock that is formed through contact metamorphism of a shale or mudstone. Contact metamorphism occurs when rocks come into contact with hot magma or lava, causing the minerals in the rocks to recrystallize and form new minerals. In the case of hornfels, the high temperatures from the contact with the magma or lava cause the clay minerals in the shale or mudstone to recrystallize into a dense, fine-grained rock with no visible foliation. This process results in the formation of hornfels.Rate this question:
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- 10.
Which of the following would exhibit sheared and mechanically fragmented rocks?
- A.
Fault movements at shallow depths
- B.
Intense compression in a deep-seated, regional metamorphic zone
- C.
Heating of shales and mudstones near a pluton
- D.
Regional metamorphism of pyroclastic volcanic rocks
Correct Answer
A. Fault movements at shallow depthsExplanation
Fault movements at shallow depths would exhibit sheared and mechanically fragmented rocks because when rocks experience faulting, they are subjected to intense stress and strain. This can result in the rocks breaking and sliding past each other along the fault plane, leading to shearing and fragmentation. The shallow depth of the fault movements implies that the rocks are not subjected to the high temperatures and pressures associated with deep-seated regional metamorphism or heating near a pluton, which are more likely to cause recrystallization and alteration rather than mechanical fragmentation. Regional metamorphism of pyroclastic volcanic rocks may lead to changes in mineral composition and texture, but not necessarily to shearing and fragmentation.Rate this question:
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- 11.
Which of the following best describes the conditions of contact metamorphism?
- A.
Pressures are very high, the rock is deeply buried, and temperatures are raised by the Earth's internal heat.
- B.
Pressures are fairly low, the rock is in the upper part of the crust, and heat is supplied from a nearby magma body.
- C.
Heat is generated by shearing and mechanical movements along faults.
- D.
Depths are fairly shallow, but temperatures and pressures are so high that the rocks begin to partially melt.
Correct Answer
B. Pressures are fairly low, the rock is in the upper part of the crust, and heat is supplied from a nearby magma body.Explanation
Contact metamorphism occurs when rocks come into contact with a nearby magma body, resulting in heat being transferred from the magma to the surrounding rocks. The pressures involved in contact metamorphism are relatively low, and the rocks undergoing metamorphism are typically located in the upper part of the Earth's crust. This process does not involve shearing or mechanical movements along faults.Rate this question:
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- 12.
________ forms from the metamorphism of limestone or dolostone.
- A.
Migmatite
- B.
Amphibolite
- C.
Marble
- D.
Quartzite
Correct Answer
C. MarbleExplanation
Marble forms from the metamorphism of limestone or dolostone. During metamorphism, the heat and pressure cause the minerals in limestone or dolostone to recrystallize, resulting in the formation of marble. This process also causes the original sedimentary textures and structures to be destroyed, and the rock becomes more compact and dense. Marble is known for its characteristic smooth texture, variety of colors, and ability to take a high polish, making it a popular material for sculptures, building facades, and countertops.Rate this question:
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- 13.
What foliated, metamorphic rock is texturally intermediate between slate and schist?
- A.
Fault breccia
- B.
Phyllite
- C.
Quartzite
- D.
Gneiss
Correct Answer
B. PhylliteExplanation
Phyllite is a foliated metamorphic rock that is texturally intermediate between slate and schist. It is characterized by its fine-grained texture and a glossy sheen caused by the alignment of its microscopic mica minerals. Phyllite forms from the low-grade metamorphism of shale or slate, and its mineral composition includes primarily mica, quartz, and chlorite. It exhibits a higher degree of metamorphism than slate but is not as highly metamorphosed as schist.Rate this question:
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- 14.
________ is characterized by the segregation of light- and dark-colored minerals into thin layers or bands.
- A.
Garnet hornfels
- B.
Granitic gneiss
- C.
Slate
- D.
Quartzite
Correct Answer
B. Granitic gneissExplanation
Granitic gneiss is characterized by the segregation of light- and dark-colored minerals into thin layers or bands. This rock type forms through the metamorphism of granite, where the minerals within the granite recrystallize and align themselves into distinct layers. The light-colored minerals, such as quartz and feldspar, form the lighter bands, while the dark-colored minerals, such as biotite and amphibole, form the darker bands. This layering or banding gives granitic gneiss its characteristic appearance and distinguishes it from other rock types such as garnet hornfels, slate, and quartzite.Rate this question:
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- 15.
What type of foliation results from the parallel alignment of abundant, coarse-grained, mica flakes in a metamorphic rock?
- A.
Schistosity
- B.
Gneissic banding
- C.
Slaty cleavage
- D.
Phyllitic structure
Correct Answer
A. SchistosityExplanation
Schistosity is the correct answer because it refers to the parallel alignment of abundant, coarse-grained mica flakes in a metamorphic rock. This alignment creates a foliation that is characteristic of schist rocks. Gneissic banding refers to alternating layers of light and dark minerals, slaty cleavage refers to the ability of a rock to split into thin sheets, and phyllitic structure refers to a fine-grained foliation resulting from low-grade metamorphism.Rate this question:
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- 16.
Which of the following metamorphic rocks could be used to neutralize acidic mine waters?
- A.
Granite gneiss
- B.
Quartzite
- C.
Slate
- D.
Marble
Correct Answer
D. MarbleExplanation
Marble is the correct answer because it is a metamorphic rock composed mainly of calcite or dolomite minerals, which have the ability to neutralize acidic waters. When acidic mine waters come into contact with marble, the calcite or dolomite minerals in the rock react with the acid, causing the pH of the water to increase and become more neutral. This makes marble an effective choice for neutralizing acidic mine waters.Rate this question:
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- 17.
Which of the following lists the rocks in the order of increasing grain size and increasing grade of metamorphism?
- A.
Phyllite, slate, schist
- B.
Schist, slate, phyllite
- C.
Slate, phyllite, schist
- D.
Slate, schist, phyllite
Correct Answer
C. Slate, phyllite, schistExplanation
The correct answer is slate, phyllite, schist. This is because in the process of metamorphism, rocks undergo changes in their mineral composition and texture. Slate is the lowest grade of metamorphic rock, with fine-grained texture and low-grade metamorphism. Phyllite is the next grade, with slightly larger grain size and higher grade of metamorphism. Schist is the highest grade, with even larger grain size and more advanced metamorphism. Therefore, the correct order is slate, phyllite, schist.Rate this question:
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- 18.
________ is typically formed by metamorphism of a sandstone.
- A.
Marble
- B.
Slate
- C.
Amphibolite
- D.
Quartzite
Correct Answer
D. QuartziteExplanation
Quartzite is typically formed by metamorphism of a sandstone. During the metamorphic process, the sandstone undergoes intense heat and pressure, causing the grains of sand to recrystallize and fuse together, forming a hard and durable rock known as quartzite. This process also leads to the removal of any original sedimentary features, resulting in a rock with a smooth and granular texture. Therefore, quartzite is the correct answer for this question.Rate this question:
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- 19.
Which of the following rocks would exhibit visible, textural evidence of having undergone some partial melting?
- A.
Fault breccia
- B.
Migmatite
- C.
Slate
- D.
Foliated hornfels
Correct Answer
B. MigmatiteExplanation
Migmatite would exhibit visible, textural evidence of having undergone some partial melting. Migmatite is a rock that has undergone both melting and solidification processes, resulting in a mixture of igneous and metamorphic features. It typically displays a banded appearance with light-colored, melted rock (magma) injections, known as leucosomes, within a darker, solidified matrix, known as melanosome. This distinctive texture is a clear indication of partial melting and subsequent recrystallization.Rate this question:
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- 20.
What is the major source of heat for contact metamorphism?
- A.
Deep burial and heat from the Earth's interior
- B.
Heat from grinding and shearing on faults
- C.
Heat from the spontaneous decomposition of micas and feldspars
- D.
Heat from a nearby magma body
Correct Answer
D. Heat from a nearby magma bodyExplanation
The major source of heat for contact metamorphism is heat from a nearby magma body. When magma intrudes into the surrounding rocks, it releases a significant amount of heat, causing the rocks to undergo metamorphic changes. This heat is responsible for altering the mineralogy and texture of the rocks in contact with the magma, leading to the formation of new minerals and the recrystallization of existing ones.Rate this question:
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- 21.
In which setting would regional metamorphism be most likely?
- A.
At shallow depths below an oceanic ridge or rift zone
- B.
At shallow depths along major transform faults in the continental crust
- C.
At great depths in the crust where two continents are colliding
- D.
At shallow depths beneath the seafloor where water pressures are immense
Correct Answer
C. At great depths in the crust where two continents are collidingExplanation
Regional metamorphism is most likely to occur at great depths in the crust where two continents are colliding. This is because the collision of two continents causes intense pressure and heat, which leads to the formation of regional metamorphic rocks. In this setting, the rocks undergo significant changes in mineral composition and texture due to the high temperatures and pressures involved. The other options, such as shallow depths below an oceanic ridge or rift zone, along major transform faults in the continental crust, or beneath the seafloor where water pressures are immense, do not typically generate the same level of pressure and heat required for regional metamorphism.Rate this question:
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- 22.
Graphite is identified in a particular schist. Which one of the following conclusions is justified?
- A.
The pre-metamorphic rock was a shale or mudstone containing organic matter.
- B.
The rock also contains diamonds; both are crystalline forms of the element carbon.
- C.
The schist formed from a quartz-rich, sedimentary limestone.
- D.
The graphite lubricated shearing movements along a fault, causing a schist to form.
Correct Answer
A. The pre-metamorphic rock was a shale or mudstone containing organic matter.Explanation
The presence of graphite in the schist suggests that the pre-metamorphic rock was a shale or mudstone containing organic matter. Graphite is a form of carbon that is commonly found in organic-rich rocks such as shale and mudstone. Therefore, it is justified to conclude that the pre-metamorphic rock in this case was a shale or mudstone with organic matter.Rate this question:
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- 23.
Amphibolite is a foliated metamorphic rock composed principally of hornblende and plagioclase. How does it form?
- A.
By contact metamorphism of sandstone along the contact with a granitic batholith
- B.
By regional metamorphism of volcanic rocks such as andesite and basalt
- C.
By gouging and crushing of limestone along a fault
- D.
By the impact of an asteroid on interbedded sandstone and shale
Correct Answer
B. By regional metamorphism of volcanic rocks such as andesite and basaltExplanation
Amphibolite forms through regional metamorphism of volcanic rocks such as andesite and basalt. This process involves the transformation of existing rocks under high temperature and pressure conditions over a large area. As the volcanic rocks are subjected to these intense conditions, their mineral composition and texture change, resulting in the formation of amphibolite. This rock is characterized by the presence of hornblende and plagioclase minerals, which are indicative of its metamorphic origin. The other options listed do not involve the specific conditions required for the formation of amphibolite.Rate this question:
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- 24.
What term describes the zone of contact metamorphism surrounding an intrusive magma body?
- A.
Aura
- B.
Auricle
- C.
Oracle
- D.
Aureole
Correct Answer
D. AureoleExplanation
The term that describes the zone of contact metamorphism surrounding an intrusive magma body is aureole. This term refers to the area where the surrounding rocks are altered due to the heat and fluids released by the magma as it intrudes into the pre-existing rock. This metamorphism leads to the formation of new minerals and the recrystallization of existing ones, resulting in distinct changes in the rock composition and structure within the aureole.Rate this question:
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- 25.
During metamorphism, what is the major effect of chemically active fluids?
- A.
Increase the pressures in deeply buried, regional-metamorphic zones
- B.
Aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grains
- C.
Prevent partial melting so solid rocks can undergo very high temperature regional metamorphism
- D.
Facilitate the formation of schistosity and gneissic banding in hornfels and slates
Correct Answer
B. Aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grainsExplanation
Chemically active fluids during metamorphism aid in the movement of dissolved silicate constituents and facilitate the growth of mineral grains. These fluids help to transport and distribute the dissolved minerals, allowing them to recrystallize and form new mineral grains. This process is essential for the development of metamorphic textures and the transformation of the rock. The fluids also play a role in chemical reactions, promoting the exchange of elements and the formation of new minerals.Rate this question:
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- 26.
What two, metamorphic rocks are composed predominantly of single minerals?
- A.
Mica schist and granitic gneiss
- B.
Fault breccia and graphitic schist
- C.
Garnet schist and hornfels
- D.
Marble and quartzite
Correct Answer
D. Marble and quartziteExplanation
Marble and quartzite are two metamorphic rocks that are composed predominantly of single minerals. Marble is primarily made up of the mineral calcite, while quartzite is composed mainly of the mineral quartz. Both rocks undergo metamorphism, which causes the minerals within them to recrystallize and form a solid, interlocking structure. This results in the formation of rocks that are predominantly made up of a single mineral.Rate this question:
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- 27.
A ________ forms at very high pressures but moderately low temperatures associated with subduction of oceanic crust and sediments.
- A.
Mylonite
- B.
Migmatite
- C.
Biotite marble
- D.
Blueschist
Correct Answer
D. BlueschistExplanation
Blueschist forms at high pressures but low temperatures during the subduction of oceanic crust and sediments. This metamorphic rock is characterized by its blue color and contains minerals such as glaucophane and lawsonite. The high pressure conditions cause the mineral grains to align in a specific orientation, giving blueschist its distinctive foliated texture. The moderately low temperatures prevent the rock from fully recrystallizing, resulting in a unique combination of mineral composition and texture.Rate this question:
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- 28.
Partial melting is an important process in the formation of migmatites.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Partial melting is indeed an important process in the formation of migmatites. Migmatites are rocks that have undergone both partial melting and solidification. During partial melting, certain minerals within the rock melt at high temperatures, while others remain solid. This process leads to the formation of a partially molten rock, which then cools and solidifies to form a migmatite. Therefore, the statement "Partial melting is an important process in the formation of migmatites" is true.Rate this question:
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- 29.
Slate and schist are both derived by metamorphism of shales and mudstones.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Slate and schist are both derived by metamorphism of shales and mudstones. This means that when shales and mudstones undergo metamorphic processes such as heat and pressure, they can transform into slate or schist. Therefore, the statement that slate and schist are both derived by metamorphism of shales and mudstones is true.Rate this question:
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- 30.
Hornfels are metamorphic rocks produced at great depths and high temperatures associated with regional metamorphism.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Hornfels are metamorphic rocks that are produced at great depths and high temperatures associated with contact metamorphism, not regional metamorphism.Rate this question:
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- 31.
Calcite is the main mineral constituent of the sedimentary rock limestone and of the metamorphic rock marble.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Calcite is indeed the main mineral constituent of both limestone and marble. Limestone is a sedimentary rock primarily composed of calcite, while marble is a metamorphic rock that forms from the recrystallization of limestone. Therefore, it is correct to say that calcite is the main mineral constituent of both limestone and marble.Rate this question:
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- 32.
Metamorphic rocks formed during episodes of mountain building typically show textural characteristics indicative of shearing stress and deformation.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
During episodes of mountain building, intense pressure and heat cause the rocks to undergo metamorphism, resulting in the formation of metamorphic rocks. These rocks often exhibit textural characteristics that indicate the presence of shearing stress and deformation, such as foliation and banding. This is because the intense forces and movement associated with mountain building can cause the minerals within the rocks to align and reorganize, creating these distinctive textures. Therefore, the statement that metamorphic rocks formed during episodes of mountain building typically show textural characteristics indicative of shearing stress and deformation is true.Rate this question:
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- 33.
Amphibolites have gneissic textures and form by regional metamorphism of granites and rhyolites.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Amphibolites do not have gneissic textures and do not form by regional metamorphism of granites and rhyolites. Instead, they are formed by the metamorphism of basaltic rocks.Rate this question:
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- 34.
At high pressures and elevated temperatures of regional metamorphism, silicate rocks are more resistant to flowage and deformation than at low temperatures and pressures.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
At high pressures and elevated temperatures of regional metamorphism, silicate rocks are actually more prone to flowage and deformation. This is because the increase in temperature and pressure causes the minerals in the rocks to become more ductile, allowing them to deform more easily. Therefore, the statement that silicate rocks are more resistant to flowage and deformation at high temperatures and pressures is false.Rate this question:
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- 35.
Foliated metamorphic rocks are composed largely of equidimensional grains of minerals such as quartz and calcite.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Foliated metamorphic rocks are not composed largely of equidimensional grains of minerals such as quartz and calcite. In fact, foliated metamorphic rocks have a layered or banded appearance due to the alignment of minerals in parallel planes or bands. These rocks typically contain elongated or platy minerals such as mica or chlorite. Therefore, the statement is false.Rate this question:
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- 36.
Rock cleavage or slaty cleavage in slates is largely a consequence of abundant, parallel-aligned, very fine-grained mica flakes in the rock.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given statement is true because rock cleavage or slaty cleavage in slates is indeed largely a consequence of abundant, parallel-aligned, very fine-grained mica flakes in the rock. This alignment and arrangement of the mica flakes create a distinct parallel cleavage plane in the rock, which allows it to easily split into thin, flat sheets or slabs. This characteristic is what gives slates their characteristic ability to be easily split into thin layers and makes them suitable for use as roofing material or decorative purposes.Rate this question:
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- 37.
Muscovite, biotite, and chlorite are common minerals found in phyllites and schists.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Muscovite, biotite, and chlorite are indeed common minerals found in phyllites and schists. Phyllites and schists are both metamorphic rocks that have undergone intense heat and pressure, causing the minerals within them to recrystallize and rearrange. Muscovite, biotite, and chlorite are all common minerals that form during this process and are often found in these types of rocks. Therefore, the statement is true.Rate this question:
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- 38.
The distinctive layers or bands of different minerals in gneisses may be complexly folded.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Gneisses are metamorphic rocks that are formed from the recrystallization of pre-existing rocks under high pressure and temperature conditions. These rocks often exhibit distinct layers or bands of different minerals, known as foliation. Due to the intense pressure and folding during their formation, these layers can become complexly folded, resulting in a characteristic pattern of folds within the gneiss. Therefore, the statement that the distinctive layers or bands of different minerals in gneisses may be complexly folded is true.Rate this question:
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- 39.
Quartzites and metaconglomerates are formed along faults by intensive fracturing and fragmentation of conglomerate beds and quartz veins.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because quartzites and metaconglomerates are not formed along faults by intensive fracturing and fragmentation of conglomerate beds and quartz veins. Quartzites are formed through the metamorphism of quartz-rich sandstones, while metaconglomerates are formed through the metamorphism of conglomerates. Faulting and fracturing can occur in the formation of these rocks, but they are not the primary processes involved.Rate this question:
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- 40.
High-grade, regional metamorphism produces significant and recognizable changes in the textures and mineral compositions of rocks.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
High-grade, regional metamorphism refers to intense heat and pressure that occur over large areas, such as during mountain-building processes. This type of metamorphism leads to significant changes in the textures and mineral compositions of rocks. The high temperatures and pressures cause minerals to recrystallize and form new minerals, resulting in the development of distinct textures and mineral assemblages. These changes are often visible and can be used to identify and classify metamorphic rocks. Therefore, the statement that high-grade, regional metamorphism produces significant and recognizable changes in the textures and mineral compositions of rocks is true.Rate this question:
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- 41.
Talc and graphite are very soft minerals found in some schists.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Talc and graphite are indeed very soft minerals found in some schists. Talc is known for its softness and is commonly used in cosmetic products. Graphite, on the other hand, is a form of carbon that is also very soft and is used in pencils. Both minerals can be easily scratched or marked, confirming that the statement is true.Rate this question:
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- 42.
Three major factors involved in metamorphism are elevated temperature, elevated pressure, and the chemical action of hot fluids.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because these three factors - elevated temperature, elevated pressure, and the chemical action of hot fluids - are indeed involved in the process of metamorphism. Metamorphism refers to the transformation of rocks due to changes in these factors over time. Elevated temperature and pressure cause the minerals in rocks to recrystallize and rearrange their structure, resulting in the formation of new minerals and textures. The chemical action of hot fluids can also contribute to the alteration of rocks by introducing new elements and facilitating chemical reactions. Therefore, all three factors play a crucial role in the metamorphic process.Rate this question:
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- 43.
During metamorphism, most rock is composed of solid mineral grains, but small amounts of hot fluids or partial melting may facilitate the metamorphic process.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
During metamorphism, solid mineral grains undergo changes in their texture, composition, and structure due to high temperature and pressure. However, in some cases, the metamorphic process can be facilitated by the presence of hot fluids or partial melting. These fluids can aid in the movement and recrystallization of minerals, leading to further changes in the rock. Therefore, it is true that small amounts of hot fluids or partial melting can play a role in the metamorphic process.Rate this question:
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Testing Your Knowledge of the Gutenberg Discontinuity Quiz
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