Across
- 6. How scientists study the inside of Earth since we can’t drill down that far
- 10. A break in Earth’s crust where rocks slipped past each other
- 11. Where seafloor spreading begins
- 13. When molten material is added to make new oceanic crust
- 14. Valley along the ocean floor where oceanic crust sinks into the mantle
- 15. When pieces of Earth’s crust diverges on land
- 16. Scientist that came up with the theory of continental drift
- 17. What scientists use to explore the ocean floor
- 18. The theory that Earth’s plates are in a slow, constant motion
- 20. Produced when 2 continental plates collide
Down
- 1. The remains of a prehistoric organism
- 2. Causes the plates to move
- 3. When oceanic crust sinks beneath a deep-ocean trench and back into the mantle
- 4. Theory of how the continents spread away from each other
- 5. When plates move away from each other
- 7. 3rd layer of Earth that is very hot, yet solid where convection currents are
- 8. Supercontinent that existed around 300 million years ago
- 9. When plates come together
- 12. Measure of how much mass there is in an object
- 19. When plates slip past each other