what is a tropical island corral reef made
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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. ... They are most commonly found at shallow depths in tropical waters, but deep water and cold water coral reefs exist on smaller scales in other areas.
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A ridge of rock in the sea formed by the growth and deposits of coral are called tropical coral reefs.
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