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