9-11-17

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Across
  1. 3. An aggressive young man that is usually a trouble maker.
  2. 5. floor spreading The process by which molten material add new crust below Earth's bodies of water.
  3. 7. The process by which crust sinks back into the mantle at a colliding plate boundary.
  4. 9. Apartment housing that is overcrowded and not well taken care of.
Down
  1. 1. A deep undersea valley where the crust sinks toward the mantle.
  2. 2. A force that sends a object forward.
  3. 4. An original version or blueprint.
  4. 5. A device that reflects sound waves off underwater objects and records.
  5. 6. ocean ridge An undersea chain of mountains that is part of a long system of underwater mountains
  6. 8. The way a person behaves.