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Ch. 9 Study Guide Answers

Ch. 9 Study Guide Answers . 2011. A vent or fissure in the Earth’s surface through which magma and gases are expelled is called A Volcano. What would you expect to see during a non-explosive eruption ? Huge lava flows. Molten rock deep underground often gathers in a Magma Chamber.

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Ch. 9 Study Guide Answers

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  1. Ch. 9 Study Guide Answers 2011

  2. A vent or fissure in the Earth’s surface through which magma and gases are expelled is called • A Volcano

  3. What would you expect to see during a non-explosive eruption? • Huge lava flows.

  4. Molten rock deep underground often gathers in a • Magma Chamber

  5. Which type of lava flows most like dripping wax? • Pahoehoe

  6. Lava that is very runny probably • has a low silica content

  7. If the water content of magma is high, • an explosive eruption is more likely

  8. When you talk about the viscosity of lava, you are talking about • how the lava flows (thickness).

  9. Most active volcanoes form • (80%) where tectonic plates collide

  10. Cool, stiff lava that forms in jumbled heaps of sharp chunks near the vent is called • Blocky Lava

  11. Which type of pyroclastic material gets its name from a word that means “little stones”? • Lapilli.

  12. The pyroclastic material that can reach the upper atmosphere and circle the Earth for years is • Volcanic Ash.

  13. Pyroclastic material forms when • magma explodes from a volcano and hardens in the air.

  14. Describe a possible climate change caused by a volcanic eruption? • Volcanic Ash high in the atmosphere could block sunlight, causing (regions of earths) temperatures to drop.

  15. Where are volcanoes most likely to form? • Along plate boundaries

  16. Large blobs of magma that harden in the air are called • Volcanic Bombs.

  17. A large depression that forms when the magma chamber partially empties is a • Caldera.

  18. The three main types of volcanoes are • Shield Volcano, Cinder Cone Volcano, and Composite Volcano.

  19. The depression created when the roof of a magma chamber collapses is called a • Caldera

  20. Rock begins to melt when (what happens) • temperature on the rock increases and pressure decreases

  21. Most active volcanoes form • where tectonic plates collide

  22. When an oceanic plate collides with a continental plate, the oceanic plate is usually sub-ducted because • the oceanic plate is denser and thinner than the continental crust.

  23. A cinder cone volcano • has steep slopes

  24. The volcanoes of Hawaii and other places far from tectonic plate boundaries are known as • Hot Spots

  25. Which category of volcano is most likely to erupt in the near future? • An active volcano

  26. An active volcano • is currently erupting or show signs of erupting. In the near future.

  27. What would you expect to see during a non-explosive eruption? • Calm lava flows

  28. Pillow lava is • formed when lava erupts under water

  29. Lava with a high viscosity • is thick like pudding

  30. What would you expect after an explosive eruption? • Darkened Skies.

  31. A shield volcano • has gently sloping sides

  32. A combination of explosive and non-explosive eruptions will create a • composite volcano

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