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
Hydrothermal circulation continues for millions of years as the rocks cool.
We have seen all the material that will be covered on Exam I