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.
3. these hot spots do not move with the overlying mantle and thus remain fixed in location for tens of millions of years
We have seen all the material that will be covered on Exam I