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Silica
material with composition of SiO2
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shield volcano
a broad, gently sloping volcanic cone of flat-dome shape, usually seceral tens or hundreds of square miles in extent
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Composite cone (stratovolcano)
a volcano that is constructed of alternating layers of lava and pyroclastic deposits
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caldera
a large basin shaped volcanic depression, more or less circulr, the diameter of which is many times greater that of the included vent or vents.
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Lahar
a wet mixture of water, mud, and volcanic rock fragments, with the consistency of wet concrete, that flows down the slopes of a volcano and its river valleys.
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Viscosity
the property of a fluid to offer internal resistance to flow
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pyroclastic flow
a high density mixture of hot ash and rock fragments with hot gases formed by a volcanic explosion or aerial expulsion from volcanic vent
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volcano bomb
a blob of lava that was ejected while viscous and recieved a rounded shap while in flight.
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lapilli
pyroclastic in the generals size range of 2 to 64 mm.
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Ash
fine pyroclastics in the general size range of 2 to 64mm
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volcanic explosivity index
the percentage of pyroclastics among the total products of a volcanic eruption
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Intrusive igneous rock
igneous rock formed at considerable depth by the crystallization of magma
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Extrusive igneous rock
an igneous rock that has formed by eruption of lava onto the surface of the earth
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