Evan 09-10-18 crossword

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