PLATE TECTONICS. Earth made of concentric spheres ( Fig. 1.14 ) p 18 T-14. 1. Inner core - rich in iron and nickel, dense 2. Outer core - liquid 3. Mantle Asthenosphere - nearly molten and can flow very slowly
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Hydrothermal circulation continues for millions of years as the rocks cool.
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END Plate Tectonics
We have seen all the material that will be covered on Exam I