Chapter 16 Volcanoes

17 terms by coomesk

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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 from 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

magma

molten rock

lava

magma that flows onto the Earth's surface

ash

dust-sized particles blown into the atmosphere by volcanic eruptions

pumice

volcanic rock that can actually float in water

pyroclastic material

material formed when magma is blasted into the air and hardens

pyroclastic flow

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

stratovolcanoes

another name for composite volcanoes

rifts

long cracks in the Earth's surface

Ring of Fire

chain of volcanoes surrounding the Pacific Ocean

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