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.
Go to web for animation
END Plate Tectonics
We have seen all the material that will be covered on Exam I