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
- 5. a picture or drawing that represents a picture word or idea
- 7. A deep undersea valley where crust sinks toward the mantle
- 9. A device that reflects sound waves off underwater objects and records the echoes
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 an undersea chain of mountains that is part of a long system of underwater mountains
- 6. a sharpened reed used to press markings into clay tablets
- 8. floor spreading the process by which molten material adds new crust below Earth’s bodies of water