Paricutin Test 2 Ch.4-8

61 Questions | Total Attempts: 43

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Volcano Quizzes & Trivia

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.


Questions and Answers
  • 1. 
    Lava flows are typically finer grained than intrusive igneous rocks. Why?
    • A. 

      Intrusive magma is cooler because it is well insulated by the surrounding rock.

    • B. 

      Intrusive magma flows onto the Earth's surface and cools very slowly, allowing many small mineral grains to grow.

    • C. 

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

    • D. 

      The extrusive magma, because it is deep below the surface, cools very slowly, producing very small mineral grains.

  • 2. 
    What does Bowen’s Reaction Series describe?
    • A. 

      The pressures that different minerals are formed in metamorphic rocks

    • B. 

      Which minerals are recrystallized in a sedimentary rock

    • C. 

      The temperatures at which different minerals crystallize out of a melt

    • D. 

      All of the above

    • E. 

      None of the above

  • 3. 
    Which of the following rocks is likely to have the most quartz within it and why?
    • A. 

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

    • B. 

      Rhyolite; extrusive rock that formed from cooling of relatively low silica magma.

    • C. 

      Diorite; intrusive rock that formed from the cooling of relatively intermediate silica magma.

    • D. 

      Basalt; extrusive rock that formed from cooling of relatively low silica lava.

  • 4. 
    What is the most important factor for whether magma cools slowly or quickly?
    • A. 

      Temperature of the environment – lower T = slower magma cooling.

    • B. 

      The presence or absence of volatiles (gases) – more gases = slower magma cooling.

    • C. 

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

    • D. 

      Pressure of the environment – lower P = slower magma cooling.

  • 5. 
    Igneous rocks are produced largely by ________.
    • A. 

      The changing of a rock from one set of minerals to another

    • B. 

      The compaction of metamorphic rocks

    • C. 

      The melting of sedimentary rocks

    • D. 

      The cooling of magma

    • E. 

      Both c and d are correct.

  • 6. 
    Glassy igneous rocks form when the magma ________.
    • A. 

      Cools so fast that mineral grains cannot crystallize and grow

    • B. 

      Cools so slowly that only one mineral is formed

    • C. 

      Is a rhyolitic type

    • D. 

      Cools at an extremely high temperature

  • 7. 
    Which of the following igneous rocks exhibit aphanitic texture?
    • A. 

      Granite; gabbro

    • B. 

      Rhyolite, gabbro

    • C. 

      Andesite; rhyolite

    • D. 

      Basalt; diorite

  • 8. 
    What do pumice and obsidian have in common?
    • A. 

      Basaltic composition

    • B. 

      Phaneritic texture

    • C. 

      Ultramafic compostion

    • D. 

      Glassy texture

  • 9. 
    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?
    • A. 

      The rock heats up and expands at lower pressures, causing it to liquefy.

    • B. 

      Temperatures remain high as lowered pressures decrease melting temperatures.

    • C. 

      The lowered pressures cause rapid heat loss accompanied by melting.

    • D. 

      None of the above.

  • 10. 
    Why do magmas rise toward Earth's surface?
    • A. 

      Magmas are more viscous than solid rocks in the crust and upper mantle.

    • B. 

      Most magmas are richer in silica than most crustal and upper mantle rocks.

    • C. 

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

    • D. 

      All of the above.

  • 11. 
    _______ magma is the most abundant type erupted at oceanic spreading centers.
    • A. 

      Pegmatitic

    • B. 

      Basaltic

    • C. 

      Rhyolitic

    • D. 

      Granitic

  • 12. 
    What volcanic events formed Crater Lake, OR? When did it happen?
    • A. 

      The crater of a large, extinct cinder cone filled with water; 5 million years ago

    • B. 

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

    • C. 

      Landslides and volcanic mudflows dammed the Mazama River; 500 years ago

    • D. 

      A powerful explosion blew away the top of a stratovolcano: 10 million years ago

  • 13. 
    The Columbia Plateau in Washington and Oregon is_______.
    • A. 

      A thick stack of welded-tuff layers

    • B. 

      A field of large stratovolcanoes

    • C. 

      A flood basalt plateau

    • D. 

      A caldera filled with rhyolitic lava flows

  • 14. 
    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. 

      The eruption added large amounts of carbon dioxide to the atmosphere.

    • B. 

      The eruptive cloud destroyed parts of the Earth's protective ozone layer.

    • C. 

      Radioactive atoms blown into the atmosphere glowed red as they decayed.

    • D. 

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

  • 15. 
    A_______ is a intrusive, igneous rock body that is tabular and concordant.
    • A. 

      Dike

    • B. 

      Stock

    • C. 

      Batholith

    • D. 

      Sill

  • 16. 
    Which type of basaltic lava has a fairly smooth, unfragmented ropey surface?
    • A. 

      Aa

    • B. 

      Scoria

    • C. 

      Pahoehoe

    • D. 

      Pegmatitic

  • 17. 
    Which are the four most important physical processes of mechanical weathering?
    • A. 

      Frost wedging, exfoliation, biological activity, dissolution

    • B. 

      Exfoliation, thermal expansion, biological activity, hydrolysis

    • C. 

      Exfoliation, frost wedging, expansion, hydrolysis

    • D. 

      Frost wedging, unloading expansion, thermal expansion, biological activity

  • 18. 
    Which best describes the “soil profile” and its relevance to weathering?
    • A. 

      Soil-forming processes occur from the bottom-up. This causes vertical variations in soil composition, texture, structure, and color.

    • B. 

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

    • C. 

      Soil-forming processes occur in single layers at a time. This causes each layer to appear differently in composition, texture, structure, and color.

    • D. 

      Soil-forming processes occur laterally in the same layer, so different vertical profiles allows geologists to determine that variation from place to place.

  • 19. 
    Why is the humus layer typically thicker in a cool, temperate, forest soil than in a tropical rainforest soil?
    • A. 

      Less humus is produced in the tropical rainforest because the B horizon is so poorly developed.

    • B. 

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

    • C. 

      More humus is produced in the tropical rainforest, but it is quickly washed away by the heavy rains.

    • D. 

      In a tropical rainforest, the forest-floor litter is often burned during the dry season.

  • 20. 
    In terrain with steep hill slopes, which crop and cultivation technique will minimize soil erosion?
    • A. 

      Corn; rows trending straight down the slope, frequent cultivation.

    • B. 

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

    • C. 

      Winter wheat; after the harvest, the field is plowed and left idle until next fall.

    • D. 

      Beans; rows are spaced wider than on a level field.

  • 21. 
    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?
    • A. 

      North-facing slopes receive more sunlight in the summer; snow melts faster and more soil moisture is available for the trees.

    • B. 

      South-facing slopes receive more moisture and sunlight; rock weathering is slower.

    • C. 

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

    • D. 

      South-facing slopes receive less moisture, yet rock weathering is faster.

  • 22. 
    Which statement concerning mechanical weathering is NOT true?
    • A. 

      Reduces the grain sizes of rock particles

    • B. 

      Allows for faster rates of chemical weathering

    • C. 

      Is important in the formation of talus slopes

    • D. 

      Involves a change in the mineral composition of the weathered material

  • 23. 
    Which is the greater erosive force: wind or water?
    • A. 

      Always wind

    • B. 

      Always water

    • C. 

      Usually wind unless there have been very heavy rainstorms in the area

    • D. 

      Usually water unless it is very dry in the region

    • E. 

      Both are approximately equal in terms of power globally.

  • 24. 
    A sedimentary facies is the sedimentary rock’s ________.
    • A. 

      Crystal structure of each grain

    • B. 

      Temperature at which it was formed

    • C. 

      Environment of deposition

    • D. 

      Method of turning into a metamorphic rock

  • 25. 
    Which of the following sedimentary rocks would you expect to have originally been deposited by fast-moving streams?
    • A. 

      Mudstone

    • B. 

      Oolitic limestone

    • C. 

      Graywacke

    • D. 

      Conglomerate

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