The Best Story in the Ocean

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Across
  1. 3. A large, air-breathing marine reptile with a shell and flippers
  2. 4. A vast, continuous body of salt water covering 71% of the Earth's surface
Down
  1. 1. an extremely large aquatic mammal
  2. 2. a highly intelligent marine mammal known for its playful nature
  3. 4. A semiaquatic mammal, good at swimming, that looks like a weasel with webbed feet and fur