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Earth Science Ch.9


a vent or fissure in the Earth's surface through which magma and gases are expelled

magma chamber

the body of molten rock that feeds a volcano


an opening at the surface of the Earth through which volcanic material passes


a funnel-shaped pit near the top of the central vent of a volcano


a large, semicircular depression that forms when the magma chamber below a volcano partially empties and causes the ground above to sink

lava plateau

a wide, flat landform that results form repeated nonexplosive eruptions of lava that spread over a large area

rift zone

an area of deep cracks that forms between two tectonic plates that are pulling away from each other

hot spot

a volcanically active area of Earth's surface far from a tectonic plate boundary

pyroclastic flow

produced when enormous amounts of hot ash, dust, and gases are ejected form a volcano

pyroclastic material

forms when magma is blasted into the air and hardens

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