ocean

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Across
  1. 2. at bottom of the ocean
  2. 4. surfers watch out (2 words)
  3. 8. causes global warming
  4. 10. mystical sea human
  5. 12. a school of
  6. 13. deep valley on ocean floor
Down
  1. 1. Greek sea god
  2. 3. known for its songs
  3. 5. 5 armed and pointy
  4. 6. can sting
  5. 7. way of navigation
  6. 9. rise and fall of sea level
  7. 11. Nemo's home