Across
- 3. the hypothesis of continental ________ states that the continents were once connected, but drifted apart over time
- 5. a mountain-like structure which erupts lava periodically
- 8. the enormous tidal wave
- 10. the type of boundary where two plates are moving apart
- 14. when two p[lates collide and one goes underneath the other
- 16. a rapid shaking of the ground due to a transform boundary
- 17. the meteorologist who proposed the theory of tectonic plates
- 18. the middle layer of the earth
- 19. a type of valley where there is a depression feature in the crust due to a divergent boundary
- 20. the material which new crust is formed from
- 21. the seafloor area where old crust is subducted
Down
- 1. masses which continentals sit on top of
- 2. the outer layer of the earth
- 4. the type of boundary where two plates slide past each other horizontally
- 6. the force that causes the movement of tectonic plates
- 7. the number of major tectonic plates
- 9. the name of supercontinent which is proposed in continental drift theory
- 11. the seafloor area where new crust is formed
- 12. the innermost layer of the earth
- 13. the area where two plates meet
- 15. the type of boundary where two plates are moving toward each other