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volcanovoc.2/27/09

ScIENcE QuiZ oN VoLCAno V0cAbulaRy 2.27.09 =)

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

 



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