GEOG 1300 Lecture Notes - Lecture 8: Qualitative Property, Landform, Oceanic Crust
21 Apr 2016
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Document Summary
Why mountain belts are confined to certain areas. Why oceanic crust is younger than continental crust. The interior of the earth: core o o o o. 700-2900km below upper mantle transition zone beneath asthenosphere. Lithosphere: rigid upper layer, made of crust and upper mantle floating on asthenosphere. Mohorovicic discontinuity (moho) = boundary b/w the crust and mantle. Basalt, olivine, pyroxenes, calcium rich feldspars, 6-10km, higher density 3g/cm3. Continental is higher than thinner dense oceanic crust. Amount ice sticks out is proportional to the mass of ice below. Metamorphic rocks (weathering = sediment) melting magma cooling igneous (heat = metamorphic, melt = magma) weathering sediment compaction sedimentary (melt = magma, weathering = sediment) heat and pressure metamorphic. History of plate tectonics o o o o o o o. Surface of lithosphere is fractured into a # of tectonic plates constantly in motion. Not taken seriously b/c no mechanism for movement over rigid oceanic basin.
