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