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Earth Science > Oceanography >

Paleontology > Fossil invertebrates >

Reef

Sections: Coral reefs; Reefs through time; Reefs under threat

A rigid and wave-resistant marine structure that stands above its surroundings. Biologists and geologists specify that reefs are constructed by organisms that secrete calcium carbonate skeletons. To navigators, a reef is any rocky structure that poses a threat to navigation.

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