Geosphere 1

5. The ___________ is made of not only the earth's crust but also the solid outermost part of the upper mantle
6. The theory of continental ___________ held that all continents were once connected as one supercontinent called Pangaea and have since drifted apart
8. Tectonic plates "ride" on top of the ___________, which is semi-plastic and very hot.
11. The edges where tectonic plates meet are called plate ____________.
12. Alfred _____________ theorized that the continents were moving, but he could not explain the mechanism why or how.
13. The word tectonics comes from the Greek word tekton which means to ______________.

1. The _________ mountains of Virginia were formed together with the Atlas mountains of north Africa.
2. Earth's __________ is thicker in the continents than under the oceans.
3. Scientists theorize that tectonic plates move because of the movements of __________ cycles deep inside the earth.
4. This layer makes up the largest volume of Earth.
7. One piece of evidence supporting the theory of continental drift is that the same types of _____________ have been found on continents that were once adjacent but are now far apart
9. The continents were once joined together as one supercontinent called ______________.
10. The center of Earth is the inner _____, which is made of metal and is super hot.