ocean

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Across
  1. 5. big dip in ocean
  2. 7. mountain/volcanoes underwater
  3. 8. mountains under water
  4. 9. big trench in water
Down
  1. 1. study of earth
  2. 2. h20
  3. 3. the maker of this
  4. 4. fish
  5. 6. flat area underwater