Across
- 3. One plate going under anotherridge Underwater mountain chain
- 4. Crack in Earth’s surface
- 7. Study of Earth’s plates
- 10. Melted rock on Earth’s surface
- 11. Large piece of Earth’s crust
- 12. Earth’s outer layer
- 13. Plates moving together
- 15. Ancient supercontinent
- 17. Deep valley in the ocean floor
- 18. Layer beneath the crust
- 20. Opening where lava erupts
- 21. Center of the Earth
Down
- 1. Large landmass
- 2. Plates moving apart
- 5. Rigid outer layer including crust and upper mantle
- 6. Edge where plates meet
- 8. Sudden shaking of the ground
- 9. Ocean floor spreading area
- 14. Melted rock beneath Earth’s surface
- 16. Soft layer under the lithosphere
- 19. Plates sliding past each other