Science Chpt. 3
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18 terms
Terms | Definitions |
|---|---|
 volcano | a weak spot in the crust where magma has come to the surface |
| lava | liquid magma that reaches the surface, also the rock formed when liquid lava hardens |
| magma | the molten mixture of rock-forming substances, gases, and water from the mantle |
| ring of fire | A major belt of volcanoes that rims the pacific Ocean |
| Island arc | a string of islands formed by the volcanoes along a deep ocean trench |
| hot spot | an area where magma from deep within the mantle melts through the crust above it |
| magma chamber | the pocket beneath a volcano where magma collects |
| silica | a material that is formed from the elements oxygen and silicon, silica s found in magma |
| active | said of a volcano that is erupting or has shown signs of erupting in the near future |
| dormant | said of a volcano that does not show signs of erupting in the near future |
| extinct | Said of a volcano that is unlikely to erupt again |
| cinder cone | a steep, cone shaped hill or mountain made of volcanic ash, cinders, and bombs piled up around a volcanoes opening |
| composite volcano | a tall, cone shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials |
| caldera | the large hole at the top of a volcano formed when the roof of a volcano's magma chamber collapses |
| shield volcano | a wide gently sloping mountain made of layers of lava and formed by quiet eruptions |
| geyser | a fountain of water and steam that builds up pressure underground and erupts at regular intervals |
| hot spring | a pool formed by ground water that has risen to the surface after being heated by a nearby body of magma |
| geothermal energy | energy from water or steam that has been heated by magma |
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