Across
- 3. type of current that causes movement of tectonic plates
- 5. huge pieces of rock that the lithosphere is broken into
- 6. underwater mountain range at a boundary
- 9. place where subduction occurs
- 11. boundary type where plates collide
- 13. ring around the Pacific Ocean with lots of volcanoes
- 14. all the land masses combined together
- 17. theory that explains how tectonic plates move
- 18. boundary type where plates scrape past each other
- 19. continents move just a few of these each year
Down
- 1. one piece of crust is pushed under another
- 2. oceanic plates moving apart
- 4. layer containing the crust and top of the mantle
- 7. places where tectonic plates meet
- 8. hypothesis that the continents have slowly moved
- 10. fluid-like layer beneath the lithosphere
- 12. thinner but more dense type of crust
- 15. thicker but less dense type of crust
- 16. boundary type where plates move away from each other