TECTONIC PLATES

2. The study of physical Earth, the rocks of which it is composed and the process by which they change.
5. A layer of molten iron and nickel that surrounds the inner core of Earth. (2 words)
6. Under or below.
8. At or near the middle.
10. Continents moving over Earth's surface. (2 words)
12. The outer layer of Earth.
14. The scientist who discovered continental drift.
15. A dense sphere of solid iron and nickel at the center of the Earth (2 words)
17. The supercontinent that was pulled apart by continental drift.
18. A section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust.

1. The point or line where one region ends and another begins.
3. Move apart.
4. A large piece of land.
6. The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle.
7. Part of Earth's lithosphere that surfaces in ocean basins. (2 words)
8. An undersea mountain chain where new ocean floor is produced. (3 words)
9. A rigid layer made up of the uppermost part of the crust.
11. The soft layer of the mantle on which the lithosphere floats.
13. Move together.
16. The layer of hot solid material between Earth's crust and core.