Across
- 3. A device the reflects sound waves off underwater objects and records the echoes
- 5. Apartment housing that is overcrowded and not well taken care of
- 6. An undersea chain of mountains that is part of a long system of underwater mountains
- 9. The way a person acts
Down
- 1. The process by which molten material adds new crust below Earths bodies of water
- 2. A force that sends on object forward
- 3. The process by which the crust sinks back into the mantle as it is colliding with plate boundaries
- 4. A deep undersea valley where the crust sinks towards the mantle
- 7. An original version or blueprint
- 8. An aggressive young man that is a trouble maker