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| navigate by keyword : bank bar barrier beach blue calcium carbonate cay cluster colonies coral corals destin dive ecosystem emerald formed paradise polyps reef reefbuilding reefs ridge rock sand scuba shoal skerry snorkel snorkling stony underwater water whose |
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| A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups. |
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