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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 Earths 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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- Spring '08