Coral reef

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Across
  1. 3. a rock that reamains from shells or coral
  2. 5. a glass container, where fish can live
  3. 7. a building material, which is a mixture of limestone
  4. 8. an animal with a soft body and a shell
Down
  1. 1. large sea
  2. 2. anything that makes the earth dirty and unhealthy
  3. 4. an activity of catching fish
  4. 6. you can find them at beaches and collect them