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10 Cards in this Set

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  • Back
a very hard natural igneous rock formation of visibly crystalline texture formed essentially of quartz
Granite
a moving fluid mass composed of volcanic debris and water
Lahar
the property of resistance to flow in a fluid or semifluid
Viscosity
Material that is thrown out by a volcano; including pyroclastic material and lava bombs.
Ejecta
Temporarily move peopole away from possible danger.
Evacuate
Elongated fractures or cracks on the slopes of a volcano
Fissures
Energy derived from the internal heat of the earth.
Geothermal energy
An explosive eruption in which the resultant cloud of hot ash and other material moves laterally rather than upward.
Horizontal Blast
An instrument that records seismic waves; that is, vibrations of the earth.
Seismograph
Low amplitude, continuous earthquake activity associated with magma movement.
Tremor