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Volcano Term Definitions
A slope formed a the base of a steeper slope, made of fallen and disintegrated materials.
The collection, preparation, petrographic description, and approximate dating of tephra.
The angle between the slope of a part of a volcano and some reference. The reference may be the slope of the volcano at some previous time.
A group of fine-grained, generally porphyritic, extrusive igneous rocks having alkali feldspar and minor mafic minerals as the main components, and possibly a small amount of sodic plagioclase.
Low amplitude, continuous earthquake activity often associated with magma movement.
A great sea wave produced by a submarine earthquake, volcanic eruption, or large landslide.
Rock formed of pyroclastic material.
A wide, low-rimmed, well-bedded accumulation of hyalo-clastic debris built around a volcanic vent located in a lake, coastal zone, marsh, or area of abundant ground water.