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- Dictionarycoral reef
noun
- 1. a ridge of rock in the sea formed by the growth and deposit of coral: "the small island is enclosed in the middle of the coral reef"
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- Coral reef
Ridge of rock in the sea formed by the growth and deposit of coral
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. Wikipedia
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