Plate Tectonics

2. two plates that move apart or rift.
3. when the denser oceanic plate subducts under the continental plate.
5. a scientific theory that explains the earth's continental movements.
9. outer layer.
10. rigid outer layer (crust).
11. adjoins the crust to form the lithosphere.
13. the gradual movement as the continents drift apart over time.
15. two plates that are sliding past each other.
16. a supercontinent that incorporated almost all of the continents together a few hundred years ago.
17. made mostly up of iron, very hot.
18. liquid layer.
19. solid very dense.

1. when a more dense oceanic plate slides under a less dense continental plate.
4. the middle layer and one of the thickest layers of the earth.
6. the collision of two plates.
7. when the denser oceanic plate subducts under the other one.
8. process that occurs at mid-ocean ridges where oceanic crust is formed where volcanic activity has occurred.
9. when the material pushes upward after the collision of two plates.
12. solid rock that flows slowly.
14. apart of the middle layer and has a higher temperature and pressure than the upper mantle.