1. The Piedmont section of the eastern Appalachian Mountains has a very subdued topography. why is it considered part of the Appalachian Mountains?

2. Why are the major mountain belts mostly found around the margins of continents?

3. For that matter, how do we get mountain chains, such as the Urals, that are in the interior of continents?

4. What is the P-wave shadow zone, and what does it tell us about the interior of the Earth?

5. How do the asthenosphere and lithosphere (new, plate tectonic terms) relate to the Earth's crust and mantle (older, but still used, geological terms)?

6. What evidence is there to suggest that the Earth has a metallic core? And, what evidence is there to suggest that the outer part of that core is liquid?

7. Discuss the relationship of mid-ocean ridges and deep-ocean trenches to sea-floor spreading.

8. How old are the youngest rocks that make up the oceanic crust? How old are the oldest rocks that make up the oceanic crust? Give specific geographic locations where the youngest rocks can be found and where the oldest rocks can be found.

9. What are the three possible driving mechanisms that might cause plate tectonics?

10. What is going on in the area of the East African Rift? If you went away anc came back a long time from now, what might you find there?