Across
- 4. The way a person behaves.
- 5. the echoes.
- 7. An original version or blueprint.
- 9. plate boundary.
- 10. floor spreading The process by which molten material adds new crust
- 11. ocean ridge An undersea chain of mountains that is part of a long
- 12. of underwater mountains.
- 13. The process by which crust sinks back into the mantle at a
Down
- 1. Apartment housing that is overcrowded and not well taken care
- 2. Earth’s bodies of water.
- 3. A force that sends an object forward.
- 6. A device that reflects sound waves off underwater objects and
- 8. An aggressive young man that is usually a trouble maker.
- 14. A deep undersea valley where crust sinks towards the mantle.