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