Plate Tectonics

2. What scientists use to explore the ocean floor
3. Produced when 2 continental plates collide
10. A break in Earth’s crust where rocks slipped past each other
11. Valley along the ocean floor where oceanic crust sinks into the mantle
12. Scientist that came up with the theory of continental drift
13. When plates slip past each other
15. Causes the plates to move
17. 3rd layer of Earth that is very hot, yet solid where convection currents are
19. Where seafloor spreading begins
20. When pieces of Earth’s crust diverges on land

1. Supercontinent that existed around 300 million years ago
4. How scientist study the inside of Earth since we can’t drill down that far
5. The theory that Earth’s plates are in a slow, constant motion
6. When plates move away from each other
7. When oceanic crust sinks beneath a deep-ocean trench and back into the mantle
8. When molten material is added to make new oceanic crust
9. Theory of how the continents spread away from each other
14. The remains of a prehistoric organism
16. When plates come together
18. Measure of how much mass there is in an object