Science Crossword

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