Across
- 5. An underwater canyon
- 6. A large break in Earth’s crust
- 7. Scientist who discovered continental drift
- 8. remains of ancient organisms that prove the continental drift theory
- 10. The place where mountains form
- 12. Scientist who discovered sea-floor spreading
- 13. A super continent before Pangaea
- 16. The adding of new material to the ocean floor
- 17. When the ocean floor sinks into the mantle
Down
- 1. The most recent supercontinent
- 2. Broken pieces of Earth’s crust
- 3. The theory that the plates are moving
- 4. The bottom of an ocean or sea
- 5. The place where a rift valley forms
- 9. All of the different landmasses put together
- 11. The place where faults form
- 14. Underwater mountain chains
- 15. A deep valley in Earth’s crust
- 17. Device that uses sound waves
- 18. The top layer of Earth