Across
- 4. the middle layer and one of the thickest layers of the earth.
- 5. solid rock that flows slowly.
- 7. adjoins the crust to form the lithosphere.
- 8. made mostly up of iron, very hot.
- 10. two plates that are sliding past each other.
- 12. outer layer.
- 14. when the denser oceanic plate subducts under the continental plate.
- 15. two plates that move apart or rift.
- 18. the gradual movement as the continents drift apart over time.
- 19. when the material pushes upward after the collision of two plates.
- 20. a scientific theory that explains the earth's continental movements.
Down
- 1. the collision of two plates.
- 2. rigid outer layer (crust).
- 3. apart of the middle layer and has a higher temperature and pressure than the upper mantle.
- 6. liquid layer.
- 9. process that occurs at mid-ocean ridges where oceanic crust is formed where volcanic activity has occurred.
- 11. when the denser oceanic plate subducts under the other one.
- 13. when a more dense oceanic plate slides under a less dense continental plate.
- 16. solid very dense.
- 17. a supercontinent that incorporated almost all of the continents together a few hundred years ago.