Front

magma

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Molten rock that is underground or under the earth's surface.

Front

lava

Back

Molten rock that has broken through the Earth's surface or is on the surface.

Front

Shield volcano

Back

Front

Cinder cone volcano

Back

Front

Composite volcano

Back

Front

pyroclastic material

Back

Hot gas, liquid magma, and solid rock that are ejected explosively during a volcanic eruption.

Front

caldera

Back

Front

Seismology

Back

The study of earthquakes.

Front

Seismograph

Back

An instrument that records seismic waves.

Front

Seismogram

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