Across
- 3. A plate boundary that causes earthquakes
- 4. The Remains of a prehistoric organism that can be used to prove the theory of plate motion
- 6. A plate boundary that causes volcanoes
- 7. The uppermost, rigid layer of the earth!
Down
- 1. ____ _____ Ridges. Caused by divergent plate boundaries in the middle of the ocean.
- 2. Plates are always _____
- 5. Who Founded the theory of continental drift