Volcanoes Chp. 9

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  1. dormant volcano
    might erupt again
  2. movement of one tectonic
    plate under another
  3. large depression that forms when the magma chamber partially empties is a
  4. combination of explosive and nonexplosive eruptions will create a
    composite volcano
  5. has steep slopes
    cinder cone volcano
  6. expect after an explosive eruption
    darkened skies, cooler temperatures
  7. Large blobs of magma that harden in the air
    volcanic bombs
  8. a high viscosity
    thick, like pudding
  9. forms when lava erupts under water
    Pillow lava
  10. see during a nonexplosive eruption
    calm lava flows
  11. magma explodes into the air and hardens
    Pyroclastic material
  12. pyroclastic material that can reach the upper atmosphere and circle the Earth for years
    volcanic ash
  13. lapilli
    pyroclastic material gets its name from a word that means “little stones”
  14. stiff lava that forms jumbled heaps of sharp chunks near the vent
    blocky lava
  15. lava flows most like dripping wax
    pahoehoe lava
  16. viscosity of lava
    how the lava flows
  17. water content of magma is high
    explosive eruption is more likely
  18. Lava that is very runny
    has a low silica content
  19. molten rock deep
    underground often gathers in
    magma chamber
  20. volcanoes most likely to form
    along plate boundaries
  21. volcanoes are created by
    repeated eruptions of lava
  22. active volcano
    is currently erupting or will erupt very soon
  23. extinct volcano
    • will probably never erupt
    • again
  24. tgently sloping sides
    shield volcano
  25. Volcanic activity is common along the Mid-Atlantic Ridge
    divergent boundary
  26. predicting volcanic eruptions
    • the composition of volcanic gases, internal temperature,
    • changes in the volcano’s slope
  27. Lava that has a fluid, runny consistency probably
    has a low silica content
  28. along plate boundaries
    Volcanoes are most likely to form
  29. A tiltmeter is an instrument that measures
    changes in a volcano’s slope
  30. volcano is most likely to erupt in the near future
    an active volcano
  31. volcanoes of Hawaii and other places far from tectonic plate boundaries are known as
    hot spots
  32. oceanic plate collides with a continental plate, the oceanic plate is usually subducted because
    oceanic crust is denser and thinner than continental crust
  33. active volcanoes form
    where tectonic plates collide
  34. rock begins to melt when
    temperature increases and pressure decreases
  35. depression created when the roof of a magma chamber collapses
  36. three main types of volcanoes
    shield, composite, and cinder cone
  37. climate change caused by a volcanic eruption
    ash blocks sunlight, causing temperatures to drop
  38. infrared images show that an area is getting hotter
    Magma is rising in an active volcano
  39. 5% of volcanoes on land form
    in hot spots
  40. Mauna Kea
    shield volcano
  41. Mount Rainier and Mount St. Helens
    composite volcanoes
  42. most destructive volcanic eruption
  43. repeated eruptions of lava create
  44. volcano will probably never erupt again
    an extinct volcano
  45. volcano is most likely to erupt soon
    active volcano
  46. climate change caused by a volcanic eruption
    ash blocks sunlight, causing temperatures to drop
  47. magma that blasts into the air and hardens
    pyroclastic material
  48. water content of magma is high
    explosive eruption is likely
  49. create volcanoes
    many eruptions of lava

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Volcanoes Chp. 9
2012-01-16 20:46:24

Volcanoes Chapter 9
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