Planet Earth

3. continental _ is a theory that the continents were once joined and then slowly drifted apart.
6. molten rock that is located below the Earth's surface.
7. the _ shelf is part of a continent that extends out underneath the ocean.
10. process by which oceanic plates dive beneath continental plates, causing mountains to form
11. plate _ is a term used by scientists to describe the activities of continental drift and magma flow.
12. the part of the Earth where life exists.
15. chemical or physical processes that breakdown rocks into smaller pieces.
17. the water areas of the Earth, including oceans, lakes, rivers, etc.
19. the movement of weathered rock and material by wind, glaciers, and moving water.
20. process by which magma wells up between oceanic plates and pushes plates apart.

1. outer layer of the Earth, a hard rocky shelf forming Earth's surface.
2. slow process in which an oceanic plate slides under a continental plate.
4. a crack or break in Earth's crust.
5. a process of cracking that occurs when the folded land cannot bend any further.
6. thick middle layer layer of the Earth's interior structure consisting of hot rock that is dense but flexible.
8. innermost layer of the Earth made up of a super-hot but solid inner core and a super-hot liquid outer core.
9. the layer of gas that surrounds the Earth
13. uppermost layer of the Earth that includes the crust, continents, and ocean basins.
14. a large body of ice that moves across the surface of the Earth.
16. pile of rock debris left behind by melting glaciers.
18. a bend in layers of rock, sometimes caused by plate movement.