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