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