Volcanoes - Chapter 9

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Volcanoes - Chapter 9

Test your knowledge on volcanoes and where they form, why some volcanoes are explosive, what kind of landforms are produced by volcanic eruptions, and where volcanoes can be found in the solar system. By Grant Richards, Katrina Lapham, Mckenzie Thibodeau


Questions and Answers
  • 1. 
    Most of the athenosphere is _____ because of the pressure exerted by the lithosphere above it.
    • A. 

      Water

    • B. 

      Liquid

    • C. 

      Solid

    • D. 

      Cooler

  • 2. 
    Most volcanoes are found along:
    • A. 

      Mid-Ocean Ridges and Subduction Boundaries

    • B. 

      Subduction Boundaries

    • C. 

      Divergent Boundaries

    • D. 

      Mid-Ocean Ridges and Divergent Boundaries

  • 3. 
    The characteristics of magma and the rate at which it rises depends on:
    • A. 

      The amount of water it contains

    • B. 

      The amount of silica is contains

    • C. 

      Its' melting point

    • D. 

      The amount of heavier elements it contains

  • 4. 
    At a subduction boundary, volcanoes always form where?
    • A. 

      On the subducting plate

    • B. 

      Between the two plates

    • C. 

      They do not form at subduction boundaries

    • D. 

      On the overriding plate

  • 5. 
    When two oceanic plates collide, the volcanoes create a:
    • A. 

      Hot spot

    • B. 

      Super volcano

    • C. 

      Massive earthquake

    • D. 

      Chain of volcanic islands

  • 6. 
    Where is one place where a mid-ocean ridge rises above sea level?
    • A. 

      Iceland

    • B. 

      France

    • C. 

      Japan

    • D. 

      Jamaica

  • 7. 
    How far beneath the surface do scientist estimate hot spots are?
    • A. 

      120 kilometers to 500 kilometers

    • B. 

      670 kilometers to 2,900 kilometers

    • C. 

      6,400 kilometers to 7,640 kilometers

    • D. 

      10,934 kilometers to 12,346 kilometers

  • 8. 
    Because magma’s density is lower than that of the surrounding materials around it, what does it do when it forms?
    • A. 

      Combust inside Earth's mantle

    • B. 

      Slowly sink to Earth's core

    • C. 

      It tends to rise to the surface

    • D. 

      Boil from reacting with water.

  • 9. 
    When does a volcanic eruption occur?
    • A. 

      When magma becomes more dense than surrounding objects

    • B. 

      When there is an opening in Earth's surface

    • C. 

      When the magma reaches its' boiling point

    • D. 

      When magma rises to the surface

  • 10. 
    Most magma that reaches Earth’s surface does so at:
    • A. 

      Divergent Boundaries

    • B. 

      Subduction Boundaries

    • C. 

      Convergent Boundaries

    • D. 

      Hot Spots

  • 11. 
    A _____ is an opening in Earth’s crust through that molten rock, gases, and ash erupt; also, the landform that develops around the opening.
  • 12. 
    A _____ is an area of volcanic activity that results from a plume of hot solid material that has risen from deep within Earth’s crust.
  • 13. 
    Mount St. Helens exploded violently in 1980 after more than _____ of being quiet.
    • A. 

      200 years

    • B. 

      A thousand years

    • C. 

      A century

    • D. 

      600 years

  • 14. 
    What is the percentage of basaltic magma’s silica content?
    • A. 

      20%

    • B. 

      30%

    • C. 

      40%

    • D. 

      50%

  • 15. 
    Where does andesitic magma tend to form?
    • A. 

      Divergent Boundaries

    • B. 

      Subduction Boundaries

    • C. 

      All Convergent Boundaries

    • D. 

      Mid-Ocean Ridges

  • 16. 
    What does appearance of hardened basaltic lava depends on?
    • A. 

      The elements present in the flow

    • B. 

      The temperature and speed of the flow

    • C. 

      The temperature and mass of the flow

    • D. 

      The elements present in the flow and the speed of the flow

  • 17. 
    Pyroclastic material is classified by:
    • A. 

      Speed when ejected

    • B. 

      Color

    • C. 

      Size

    • D. 

      Texture

  • 18. 
    How fast may a pyroclastic flow travel?
    • A. 

      Faster than 100 kilometers.

    • B. 

      Faster than 1000 kilometers.

    • C. 

      Faster than 200 kilometers.

    • D. 

      Faster than 300 kilometers.

  • 19. 
    What are the two main gases magma contains?
    • A. 

      Carbon dioxide and hydrogen.

    • B. 

      Water vapor and hydrogen.

    • C. 

      Water vapor and carbon dioxide.

    • D. 

      Hydrogen and sulfuric acid.

  • 20. 
    The eruption of Mount Vesuvius in A.D. 79 produced a pyroclastic flow that buried the Roman city of _____ under pumice and ash.
    • A. 

      Florence

    • B. 

      Venice

    • C. 

      Rome

    • D. 

      Pompeii

  • 21. 
    What are intermediate sized pieces of pyroclastic material called?
    • A. 

      Ash

    • B. 

      Lapilli

    • C. 

      Block

    • D. 

      Bomb

  • 22. 
    More explosive eruptions usually involve magmas which contain:
    • A. 

      Hydrogen

    • B. 

      Sulfuric Acid

    • C. 

      Water

    • D. 

      Trapped Gases

  • 23. 
    _____ is a substance’s resistance to flow.
  • 24. 
    Magma that reaches Earth’s surface is called ____.
  • 25. 
    ____ is solidified basaltic lava on land that has formed with smooth, rope-like surfaces.
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