noun
EXAMPLES FROM CORPUS
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Barrier reefs and atolls are very like each other in general form and zonation.
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Even certain elevated atolls seem to have such a thickness of limestone as to indicate subsidence before present uplift.
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In 1995 he sailed into the Moruroa test zone and hid on the atoll to frustrate the underground tests.
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In between is a minefield of smaller idyllic coconut and white sand atolls.
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It is incontrovertible that there has been long-continued subsidence on many oceanic atolls.
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This is only well developed on the seaward side of the windward reef of atolls.
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We continued along the north coast of West Spitsbergen, with a detour to the little atoll of Moffen Island.
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When the island had sunk beneath the waves the former fringe would be left as an atoll .