Plate Tectonics

3. Supercontinent over 300 million years ago.
5. Plates slide apart.
7. Plates come together .
9. Slipes past each other.
12. Continents slowly side apart over time.
13. German Scientist who hypothesis was that all continents were connected as one landmass.
14. A device that uses sound waves to measure the distance to an object.
16. Breaks in earth’s crust.
17. Deep valley.
18. Ancient organism that has been preserved.

1. Mountain ranges that ran along the ocean floor.
2. Process which ocean floor sinks beneath deep ocean trench and back into the mantle.
4. Ocean crust bends downward.
6. Measure of how much mass there is in a given volume of a substance.
7. The flow that transfers heat within a fluid .
8. Europe and Asia.
10. A layer of hot rock.
11. Plate motions and Sea floor spreading.
15. Pieces separated by cracks.