Across
- 1. A sharpened reed used to press marks into clay tablets
- 2. A mixture of copper and tin
- 7. The process by witch molten material adds new crust below earth's bodies of water
- 8. A picture or a drawing that represents a word or idea
- 9. A type of writing made up of wedge-shaped markings
Down
- 1. The process by which crust sinks back into the mantle at a colliding plate boundary
- 3. A person who specializes in writing and serves as a record keeper
- 4. A deep undersea valley where crust sinks towards the mantle
- 5. An underwater chain of mountains that is part of a long system of underwater mountains
- 6. A device that reflects sound waves off underwater objects and records the echoes