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17 terms

Chapter 16 Volcanoes

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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