Vic's Under Water Puzzle

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Across
  1. 5. Which famous ship sank in 1912 after hitting an iceberg?
  2. 6. What do fish use to breathe underwater?
  3. 7. What is the largest animal in the sea?
  4. 9. Which ocean is the largest on Earth?
  5. 10. Are dolphins mammals or fish?
  6. 12. How many arms does a typical starfish have?
Down
  1. 1. What is the deepest known point in the ocean?
  2. 2. Which sea animal is considered the fastest swimmer?
  3. 3. What is the term for the measure of how salty sea water is?
  4. 4. What mythical creature is said to lure sailors with its voice?
  5. 8. What mainly causes waves in the sea?
  6. 11. What instrument did sailors historically use to navigate using the stars?