Across
- 4. pieces of earth’s crust
- 5. a deep valley on earth’s crust
- 6. place where new ocean material slips threw the mantle
- 8. animal remains
- 10. the layer that contains the convection current
- 11. Earth’s plates and plate movements
- 14. two plates slip past each other
- 17. two plates collide
- 18. sound waves
- 19. breaks in earth’s crust
Down
- 1. the process in which ocean material sinks back into the mantle
- 2. scientist who discovered continental drift
- 3. underwater canyons
- 7. two plates move apart from each other
- 9. supercontinent
- 12. when mid-ocean ridges add new material to the ocean floor
- 13. the layer of dense solid metal
- 15. the layer of molten metal
- 16. the idea that the continents move slowly
- 17. the layer of rock that forms Earth’s outer skin