Across
- 4. A type of writing made up of wedge-shaped markings
- 5. A reed that is sharpened to make marking into clay tablets.
- 6. A device that reflects sound waves off underwater objects.
- 8. When molten metal adds new crust
- 10. A deep undersea valley where crust sinks toward the mantle
Down
- 1. An underwater chain of mountains
- 2. When the crust sinks back into the mantle
- 3. A picture or drawing that represents a word or idea
- 7. Made in ancient Mesopotamia to make stronger tools
- 9. A person that is specialized in writing and record keeping