Across
- 2. the biggest layer of the earth
- 5. when one plate goes back to the earth crust.
- 7. pieces of earth crust diverge
- 13. seams that ran along a mountain
- 15. when sea floor is moving apart
- 17. supercontinent
- 18. the thinnest part of the earth
- 19. the upper layer of the oceanic portion
- 20. a mountain with lava
Down
- 1. a pieces that are broken by cracks
- 3. breaks into earth's crust when rock slip past each other
- 4. boundary when two plates collide
- 6. when plates slide past each other
- 8. when the ocean floor plunges into deep underwater canyons
- 9. when plates move away
- 10. a bone that got turned to rock
- 11. drew map showing features of the ocean floor
- 12. a scientist
- 14. a theory why plate move
- 16. device using sound wave