Plate Tectonics

3. The remains of a prehistoric organism
6. When plates come together
7. When plates move away from each other
8. Valley along the ocean floor where oceanic crust sinks into the mantle
11. When pieces of Earth’s crust diverges on land
14. When molten material is added to make new oceanic crust
17. The theory that Earth’s plates are in a slow, constant motion
19. How scientists study the inside of Earth since we can’t drill down that far

1. Produced when 2 continental plates collide
2. Scientist that came up with the theory of continental drift
4. When oceanic crust sinks beneath a deep-ocean trench and back into the mantle
5. Causes the plates to move
9. Theory of how the continents spread away from each other
10. When plates slip past each other
12. 3rd layer of Earth that is very hot, yet solid where convection currents are
13. Where seafloor spreading begins
15. Measure of how much mass there is in an object
16. A break in Earth’s crust where rocks slipped past each other
17. Supercontinent that existed around 300 million years ago
18. What scientists use to explore the ocean floor