Hulsey's Chp. 9 Science Test

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martha.hulsey
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60747
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Hulsey's Chp. 9 Science Test
Updated:
2011-01-20 10:28:05
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Hulsey\'s Chapter Science Test
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Chp. 9 Science Test
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  1. A large, flat area covered by lava
    lava plateau
  2. a small volcano; usually erupts only for a short time
    cinder cone volcano
  3. a funnel-shaped pit
    crater
  4. created by a combination of explosive and nonexplosive eruptions
    composite volcano
  5. a tiltmeter is an instrument that measures__________
    changes in a volcano's slope
  6. which category of volcano will most likely erupt in the near future?
    an active volcano
  7. volcanoes far from tectonic plate boundaries are know as___
    hot spots
  8. Why is an oceanic plate more likely to be subducted that a continental plate?
    it is more dense and thin
  9. where do most active volcanoes form?
    where plates collide
  10. What happens to rock when temperature increases and pressure decreases?
    rock melts
  11. when the roof of a magma chamber collapses and a depression is created, what is it called?
    caldera
  12. Name the 3 main types of volcanoes.
    cinder cone, composite, shield
  13. what is formed when magma explodes into the air and hardens?
    pyroclastic material
  14. little stones is a name given to which type of pyroclastic material
    lapilli
  15. lava that forms heaps of sharp chunks
    blocky lava
  16. lava that looks like dripping wax
    pahoehoe lava
  17. how the lava flows
    viscosity
  18. what type of explosion is likely to occur if the water content of magma is high?
    explosive
  19. If lava has a low silica content, is the flow slow or is it runny?
    runny
  20. underground, molten rock usually gathers in a __________
    magma chamber
  21. in a nonexplosive eruption, what would you expect to see?
    large amounts of lava flow
  22. According to Scientist, where are volcanoes likely to occur?
    plate boundaries
  23. A vent or fissure in the Earth's surface where magma and gases are expelled is called_______________
    a volcano

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