Across
- 3. The process by which crust sinks back into the mantle at a colliding plate boundary.
- 4. A force that sends an object forward.
- 7. The process by which crust sinks back into the mantle at a colliding plate boundary.
- 8. A deep undersea valley where crust sinks towards the mantle.
- 9. A device that reflects sound waves off underwater objects and records the echoes.
Down
- 1. An aggressive young man that is usually a trouble maker.
- 2. An undersea chain of mountains that is part of a long system of underwater mountains.
- 5. Apartment housing that is overcrowded and not well taken care of.
- 6. The way a person behaves