EARTHSC 1105 Lecture Notes - Lecture 21: Hebgen Lake, Pleistocene, Quake Lake
26 Oct 2017
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Igneous rocks - rocks formed by the cooling and solidification of molten rocks: extrusive igneous rocks - formed by the solidification of lava, at earth"s surface. Intrusive igneous rocks - form when magma solidifies within the crust or mantle, inside earth: texture - size of the mineral grains. Anatomy of a volcano: magma molten rock and dissolved gases under earth"s surface, lava molten rock and dissolved gases at or on earth"s surface. Viscosity: internal resistance to flow of a liquid, magma viscosity depends on temperature and composition, increasing temperatures = decreasing viscosity, increasing silica content = increasing viscosity. >700 c [>1290 f], can travel at 200 kilometers/hour (124 mph): nue ardente glowing cloud of hot volcanic gases. Three types of volcanoes: shield volcanoes kilauea, mauna loa. 2: cinder cone volcanoes izalco, el salvador, par cutin, mexico, composite volcanoes st. helens, rainier, vesuvius, fujiyama. Volcano types: type of volcano and explosiveness of eruptions is determined by:
