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