nick science p8

2. Deepest part of the oceans
4. floor spreading the process with a new lithospheric layer forms
7. where two plates move away from each other
8. convection The primary force that causes the seafloor to spread and continent's to drift
9. cycle The process by which supercontinents form and break apart over millions of years
10. where two plates come together
13. the theory that the earths outer shell is divided
14. solid plastic layer of the mantle beneath the lithosphere
16. Section of the Earth below the crust
17. A piece of lithosphere that has a unique geologic history and that may be part of a larger piece of lithosphere such as a continent
18. a long undersea chaain
19. the process where earths crust breaks apart

1. the idea of continents moving
3. Holmes Scientist who first proposed that thermal convection in the mantle causes continental drift
4. zones places where the sea floor is forced under continental plates
5. Paleontologists noticed that these were the same on different continent's even though the continent's were separated by oceans
6. where two plates slide past each other
11. Source of heat in the mantle
12. The solid outer layer of earth that consists of the crust and the rigid upper part of the mantle
15. this piece of land formed 300 million years ago that started to break apart 200 million years ago