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