Science Crossword

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Across
  1. 4. breaks in earth's crust where rocks have slipped past each other
  2. 6. a deep underwater canyon
  3. 8. a boundary where plates move away from each other
  4. 9. when mid-ocean ridges continually add new material to the ocean floor
Down
  1. 1. mountain ranges that run along the middle of some ocean floors
  2. 2. the theory that earth's plates are in a slow constant motion due to convection currents in the mantle
  3. 3. a boundary where plates move toward each other
  4. 5. the process which the ocean floor sinks beneath deep ocean trenches and back into the mantle
  5. 7. a boundary where plates slip past each other
  6. 10. a deep valley created where earth's crust diverges on land