TECTONIC PLATES

5. The study of physical Earth, the rocks of which it is composed and the process by which they change.
6. Move apart.
8. A rigid layer made up of the uppermost part of the crust.
12. Part of Earth's lithosphere that surfaces in ocean basins. (2 words)
15. An undersea mountain chain where new ocean floor is produced. (3 words)
16. The point or line where one region ends and another begins.
17. A section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust.
18. A large piece of land.
19. Under or below.

1. The scientist who discovered continental drift.
2. A layer of molten iron and nickel that surrounds the inner core of Earth. (2 words)
3. The layer of hot solid material between Earth's crust and core.
4. The soft layer of the mantle on which the lithosphere floats.
7. A dense sphere of solid iron and nickel at the center of the Earth (2 words)
9. Continents moving over Earth's surface. (2 words)
10. The supercontinent that was pulled apart by continental drift.
11. The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle.
13. Move together.
14. At or near the middle.
18. The outer layer of Earth.