Plate Tectonics

3. A sudden and violent shaking of the ground caused by movement of tectonic plates
4. The part of the crust that makes up the ocean floor
6. An underwater mountain range caused by divergent plate boundaries
7. A tectonic belt around the Pacific Ocean that holds most of the Earth's active volcanoes
8. Deep excavations in the ground caused by subduction
10. The layer that tectonic plates move on; right under the lithosphere
12. An opening in the earth where lava erupts onto the surface
13. The thinnest layer of the Earth
15. Type of boundary where two plates come together
18. When a denser plate gets forced below a lighter plate at convergent boundaries
20. Type of fault where the hanging wall moves upward

1. The outermost shell of the earth including the crust and upper mantle
2. A supercontinent of all the landmasses together from 300 million years ago
5. The theory that all landmasses were once together and have been slowly drifting apart; proposed by Alfred Wegener
9. The part of the crust that makes up the continents
11. The layer of the Earth in between the crust and the core
14. Type of fault where the two rocks slide past each other
16. Type of fault where the hanging wall moves downward with gravity
17. Type of boundary where two plates slide past one another
19. Type of boundary where two plates move apart