TECTONIC PLATES

5. Part of Earth's lithosphere that surfaces in ocean basins. (2 words)
10. The point or line where one region ends and another begins.
11. Under or below.
12. The layer of hot solid material between Earth's crust and core.
13. An undersea mountain chain where new ocean floor is produced. (3 words)
14. A section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust.
15. A dense sphere of solid iron and nickel at the center of the Earth (2 words)
16. The scientist who discovered continental drift.
18. A layer of molten iron and nickel that surrounds the inner core of Earth. (2 words)
19. Move apart.

1. A large piece of land.
2. The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle.
3. Continents moving over Earth's surface. (2 words)
4. The study of physical Earth, the rocks of which it is composed and the process by which they change.
6. The outer layer of Earth.
7. A rigid layer made up of the uppermost part of the crust.
8. The supercontinent that was pulled apart by continental drift.
9. The soft layer of the mantle on which the lithosphere floats.
13. At or near the middle.
17. Move together.