Coral Reefs

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Across
  1. 3. The simple digestive sac inside a coral polyp.
  2. 4. A large underwater structure built by colonies of coral polyps.
  3. 5. The interconnected community of organisms living within a coral reef.
  4. 8. Algae that live inside coral and provide food through photosynthesis.
  5. 9. A small sandy island formed on top of a coral reef.
  6. 11. Essential light source that helps reef algae make food.
  7. 12. Hard outer coverings of many reef creatures like crabs and lobsters.
  8. 13. Describes the body of a coral polyp before it builds its hard skeleton.
Down
  1. 1. The world’s largest coral reef system off the coast of Australia.
  2. 2. Process algae use to make food from sunlight
  3. 6. Soft-bodied animals such as clams and snails commonly found in reefs.
  4. 7. Tiny reef-building animals that create limestone skeletons.
  5. 10. The tiny, tube-shaped animal that builds coral reefs.