Volcano Term Definitions
A crack or fracture in the earth's surface. Movement along the fault can cause earthquakes or--in the process of mountain-building--can release underlying magma and permit it to rise to the surface.
An igneous rock having abundant light-colored minerals.
Elongated fractures or cracks on the slopes of a volcano. Fissure eruptions typically produce liquid flows, but pyroclastics may also be ejected.
An eruption from the side of a volcano (in contrast to a summit eruption.)
Produced by the action of of flowing water.
The manner of breaking due to intense folding or faulting.
A vent or opening through which issue steam, hydrogen sulfide, or other gases. The craters of many dormant volcanoes contain active fumaroles.
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