Across
- 5. layer of rock that forms Earth's outer surface
- 7. the process of oceanic crust entering the mantle.
- 9. Name of a single landmass that broke apart 200 million years ago
- 10. theory that the plates are in slow constant motion
- 11. used to see the sea floor
- 12. The process of the seafloor renewing because of convection currents
- 13. causes rift valleys if on land
- 15. something you eat off of
- 16. boundary that produces mountains with 2 continental plates
- 19. movement of a fluid, caused by differences in temperature
- 20. layer of hot, solid material between the crust and core
Down
- 1. Undersea mountain chain where a new ocean floor is produced
- 2. remains of organisms that lived in the past
- 3. break in Earth’s crust
- 4. point of subduction
- 6. causes earthquakes
- 8. theory that the continents are moving across the Earth
- 14. scientist that came up with continental drift
- 17. there is a popular blank in Iceland
- 18. mountain with molten lava that can rise to the surface