Advanced Ocean-themed Crossword Puzzle
 
Listed Items
- 1.  aquatic animal that can be found in rivers, lakes, and oceans
- 2.  Breathes air through a blowhole on the top of its head
- 3.  A large area of water between land masses
- 4.  A type of marine animal that builds reefs
- 5.  A mammal that lives in the ocean and breathes air
- 6.  The periodic movement of the ocean's water