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Unformatted text preview: Volume Composition Core 10-13 g/cm 3 16 % Iron and nickle Mantle 3.3-5.7 83 % Peridotite Fe/Mg Crust 2.7-3.0 1% Si / Al enriched Core a. small inner part - solid b. larger outer part - apparently liquid Mantle a. Lower mantle - solid. Most of Earth’s volume b. Asthenosphere – same composition as lower mantle, but it is plastic and slowly flows. c. Upper mantle – consists of asthenospere plus the overlying solid rocks up to the base of the crust. Crust a. Continental– thick (20-90 km), Si & Al rich b. Oceanic – thin (5-10 km), basalt Lithosphere - The solid upper mantle and the crust. This unit is broken into “plates” that move over the asthenosphere due to convection currents....
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This note was uploaded on 04/16/2008 for the course GEOL 1403 taught by Professor Teague during the Spring '08 term at Tarrant County.
- Spring '08