Across
- 3. causes sea floor spreading
- 7. supercontinent
- 9. crust of the upper mantle
- 10. no one believed wegener
- 11. ocean floor
- 14. two plates slip past eachother
- 16. two plates moving apart
- 19. proposed the theory of continental drift
- 20. top layer
Down
- 1. wegeners theory
- 2. 1912
- 4. ocean floor moving
- 5. remains of animals
- 6. deepest place on earth
- 8. longest mountain range
- 12. one plate gets sucked under another
- 13. theory of the plates
- 15. two plates come together
- 17. discovered sea floor spreading
- 18. changed as north amerca drifted
- 21. 1940's