Across
- 3. Long chain of volcanoes surrounding the Pacific Ocean
- 8. Tectonic plates that are at the bottom of the ocean
- 10. circular movement that constantly pushes or pulls the plates to move
- 11. Boundaries that are classified in 3,Transform,Convergent,and Divergent
- 14. Two continets that fit like puzzle pieces: South America and Africa
- 15. When a denser plate is pushed down,beneath a less dense plate
- 17. Long crack in Earth's surface, usually where earthquakes occur
- 19. Meterologist that developed the first theory of continental drift
- 20. Created when two plates slide past each other
Down
- 1. Seafloor mountain system that is formed by divergent boundaries
- 2. Gigantic continent that existed 200 million years ago
- 4. Two plates move away from each other
- 5. Plates that are under surface land masses
- 6. Theory stating parts of the Earth's crust drift atop a liquid core covections in the mantel
- 7. Broken pieces of Earth's Lithosphere
- 9. Layer of rocks that forms continents.
- 12. Parallel pattern of rocks that are found at identical locations across the Mid-Atlantic Ridge
- 13. When two tectonic plates move toward each other and collide
- 16. Thin layer of crust underlying the ocean basis
- 18. Man who discovered sea floor spreading