Vocabulary for Week of 9/10/18

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Across
  1. 3. A type of writing made up of wedge-shaped markings
  2. 4. The process by which the crust sinks back into the mantle at the colliding plate boundary
  3. 5. floor spreading The process by which molten material adds new crust below Earth's bodies of water
  4. 6. A deep undersea valley where the crust sinks towards the mantle
  5. 8. A person who specializes writing and serves a record keeper
Down
  1. 1. A picture or drawing to express a word or an idea
  2. 2. A mixture of copper and tin;Used to make stronger tools
  3. 4. A sharpened reed used to make pressings on a clay tablets
  4. 5. A device that reflects sound waves off underwater object sand records the echos
  5. 7. ocean ridge A undersea chain of mountains this is a part of a long system of underwater mountains