The Ocean

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Across
  1. 1. Very intelligent sea animal that uses sounds to communicate
  2. 5. Light that reaches the top layer of the ocean and helps life grow
  3. 7. Sea organism that builds reefs and gives shelter to fish
  4. 8. System showing how energy moves from one ocean life form to another
Down
  1. 2. Gas produced partly by ocean life and needed for humans
  2. 3. Ocean pollution that can harm or kill sea animals
  3. 4. Sea animal that travels long distances and returns to its birth beach
  4. 5. Strong ocean predator that has lived for millions of years
  5. 6. Vast body of salt water that covers most of Earth
  6. 9. Tiny plants in the ocean that start the food chain