Science Crossword

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