ScIENcE QuiZ oN VoLCAno V0cAbulaRy 2.27.09 =)
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| volcano | a weak spot in the crust where magma has come to the surface
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| magma | the molten mixture of rock forming substances, gases, and water from the mantle
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| lava | liquid magma that reaches the surface; also the rock formed when liquid lava hardens
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| ring of fire | a major belt of volcanoes that rims the Pacific ocean
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| island arc | a string of islands formed by the volcanoes along a deep ocean trench
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| hot spot | an area where magma from deep within the mantle melts through the crust above it
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| magma chamber | the pocket beneath a volcano where magma collects
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| pipe | a long tube through which magma moves from the magma chamber to earths surface
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| vent | the opening through which molten rock and gas leave a volcano
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| lava flow | the area covered by lave as it pours out of a volcano's vent
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| crater | a bowl- shaped area that forms earths outer surface
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| silica | a material that it formed from the elements oxygen and silicon; silica is found in magma
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| pahoehoe | a hot, fast- moving type of lava that hardens to form smooth, rope like coils
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| aa | a slow moving type of lava that hardens to form rough chunks; cooler than pahoehoe
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| pryoclastic flow | the expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption
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| active volcano | said of a volcano that is erupting or has signs of erupting in the near future
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| dormant | said of a that does not show signs of erupting in the near future
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| extinct | said of a volcano that is unlikely to erupt again
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| hot spring | an area where magma from deep within the mantle melts through the crust above it
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| geyser | a fountain of water and stream that builds up pressure underground and erupts at regular intervals
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| shield volcano | a wide gently sloping mountain made of layers of lava and formed by quiet eruptions
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gpc1313