EVSC 2800 Study Guide - Midterm Guide: Gravitational Energy, Subduction, Unit
12 May 2016
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Geology exam one study guide: staurolite, kyanite. Melting of rocks in hot, deep crust and upper mantle. Weathering and erosion of rocks exposed at surface. Rocks under high temperatures and pressures in deep crust and upper mantle. Heat from the interior of earth drives the movement of portions of earth"s lithosphere. Sources of heat: gravitational energy at time of planetary accretion in solar nebula, radioactive decay of unstable nuclei, such as uranium and theorem, convection in the mantle moves hot, less dense, partially molten rock upward in the mantle. When it cools, it becomes more dense, and sinks again. The movement takes places extremely slowly over millions of years: the lithosphere is made up of earth"s crust plus the uppermost rocky portion of the mantle. A portion of the lithosphere that holds together and moves. As a unit is called a lithospheric plate.
