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Volcanoes

TermDefinition
Ring of Fire a major belt of volcanoes that rims the Pacific Ocean
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
vent the opening through which molten rock and gas leave a volcano
crater a bowl-shaped area that forms around a volcano's central opening
viscosity a liquid's resistance to flowing
pyroclastic flow the expulsion of ash, cinders, and gases during an explosive volcano eruption
dormant a volcano that is not currently active, but that may become active in the future
extinct a volcano that is no longer active and is unlikely to erupt again
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
cinder cone a steep, cone-shaped hill or small mountain made of volcanic ash and cinders piled up around a volcano's opening
composite volcano a tall, cone-shaped mountain in which layers of lava alternate with layers of ash
batholith a mass of rock formed when a large body of magma cools inside the crust
geothermal activity the heating of underground water by magma
geyser a fountain of water and steam that builds up pressure underground and erupts at regular intervals
Created by: Rita.Rogers
Popular Earth Science sets

 

 



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