HDE 101 Study Guide - Midterm Guide: San Andreas Fault, Volcanic Arc, Mesozoic
16 Mar 2017
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Cascades: california is divided into several geomorphic provinces; based on geology and landscape, geomorphology: characteristic landscape of an area, fxn of its geology, climate, and topography, cascades. Important bc provide [modern] model for ancestral sierra nevadas: chain of volcanic peaks, temperate rain forest and small glaciers, norcal/or/wa britcol, 14 mjr volcanoes in this chain are active/hazardous, mt. Rainier (seattle) most hazardous bc close to densely populated urban areas: mt. Fuji [japan: all cascade volcanoes aside from lassen are svs, svs extrude lava, but mostly ash, rock fragments, and gases; this is. ~6300 km; plates only ~100-250 km thick [only crust + outer mantle, aka the lithosphere: lithosphere, crust and upper mantle, thicker beneath continents (100-250 km) , thinner beneath ocean (100 km) Cool and strong layer of rock; behaves rigidly: bends/flexes/breaks, but does not flow easily, asthenosphere, upper mantle down to ~700 km, boundary between lithosphere and asthenosphere due to temp (1280c) at which rock will melt & flow.
