The Coral Reefs

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Across
  1. 4. Tiny little algae that provide food for corals
  2. 7. They are carried by the runoff water or wastewater
Down
  1. 1. They are green, and they eat algae
  2. 2. You breathe in oxygen (O2) and you breathe out ...
  3. 3. Complete this sentence: Most hard corals prefer water temperatures that range between 73° and 84° Fahrenheit (23° and 29° ...)
  4. 5. Most of them are green and look like leaves
  5. 6. They are the things that humans throw away. Sometimes you can see them floating in the oceans.