Across
- 2. that at once all continents were joined
- 4. not caused by convergent boundaries
- 5. structures on Earths crust moving over the mantle
- 6. rigid outer part of Earth, consisting of the crust and upper mantle
- 7. made the speculations that the continents might have drifted
- 8. plates sliding past each other
- 11. proposed theory of continental drift
- 15. caused by divergent boundaries
- 17. causes seafloor spreading
- 18. caused by convergent boundaries
Down
- 1. Father of Plate Tectonics
- 2. changing climates during the past
- 3. layers of rocks across continents
- 9. places certain fossils are found
- 10. supercontinent
- 12. plates moving away
- 13. plates colliding
- 14. ocean floor sinks under
- 16. underwater mountain range