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10 terms

Volcanoes

Earth Science Ch.9
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volcano
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
vent
an opening at the surface of the Earth through which volcanic material passes
crater
a funnel-shaped pit near the top of the central vent of a volcano
caldera
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