Plate Tectonics

3. solid outer layer of earth made of crust and upper part of mantle
5. undersea mountain chain with steep narrow valley
8. can form when magma erupts onto earth's surface
9. solid plastic part of the mantle
10. movement of heated material due to differences in density (different temperatures)
12. sudden movement of earth's surface
13. single, large ocean that covered earth's surface
14. single landmass that broke up to form continents
16. boundary where 2 tectonic plates are moving away from earth other
17. molten rock in earth's surface
18. breaking apart of earth's surface

1. process where oceanic seafloor forms when magma rises pushing older seafloor away
2. theory explaining how lithosphere moves and changes shape
4. study of alignment of magnetic minerals in rocks
6. boundary where 2 tectonic plate are moving toward each other
7. supercontinent that formed 300 million years ago
11. boundary where 2 plates are sliding past each other
15. piece of lithosphere with unique geologic features