Volcanic Domes
Volcanic Domes : structures formed by the extrusion of different types of lava to the earth's surface. They can be of two types: Broad dome-shaped structures of basaltic origin formed by high temperature, low viscosity lavas and, Steep-sided domes formed by more viscous rhyolitic types of lava that are pushed upward by extremely high gas pressures. Such lavas may fill up a volcanic crater and flow out laterally, or under extreme paroxysmal conditions may be puched directly into the air forming steep-sided domes of volcanic ash
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