1.28.8 **Prof. Greg Davis Internal Makeup of Planet Earth • Core is alloy/nickel • Mantle is rocky Earth (silicate minerals) • Compositional Earth o Continental crust o Oceanic crust *Increased density the closer you get to the core Mantle • Core • Rheological Earth o Lithosphere (Rigid/brittle) Asthenosphere (ducticle) • The crust and mantle are made of rocks, the minerals which make them up, and the combinations of the Earth’s 92 natural occurring elements • Minerals o Naturally occurring chemical compounds o Crystalline internal structure Specifically arranged atoms and ions o Definite or fairly definite composition o Definite or fairly definite physical properties (e.g. color, cleavage, streak, luster crystal appearance)
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