Across
- 4. North America and Eurasia were formed when a rift separated the continent of
- 5. Who hypothesized of continental drift
- 6. single large ocean that covered earths surface during Pangaea time
- 10. what ocean is tectonic plates are expanding which ocean
- 12. forming cracks in weakened continental or oceanic crust
- 13. study of the alignment of magnetic minerals in rock
- 15. plates are colliding
- 17. processes taking place in the trenches
- 19. plates are sliding horizontally
- 20. more dense currents
Down
- 1. a thin outer shell of Earth that is broken into several blocks
- 2. plates are separating
- 3. earths crust breaks apart is called
- 7. seamount colliding with continent and forming a mountain chain on continent is an example of
- 8. super continent that formed 300 million years ago
- 9. less dense currents
- 11. tectonic plates are giant slabs of
- 14. layer of plastic rock just below the lithosphere
- 16. an undersea mountain range that forms at a divergent boundary
- 18. pice of lithosphere with unique geologic history