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atoll

atoll Ring-shaped reef of coral enclosing a shallow lagoon. An atoll begins as a reef surrounding a slowly subsiding island, usually volcanic. As the island sinks, the coral continues to grow upwards until eventually the island is below sea level and only a ring of coral is left at the surface.

http://nasa.gov/Study/Maldives/maldives.html

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atoll

atoll A ring-shaped organic reef that encloses or almost encloses a lagoon and which is surrounded by the open sea. The reef may be built of coral and/or calcareous algae. An atoll is built on an existing structure such as an extinct, submerged volcano.

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"atoll." A Dictionary of Ecology. . Encyclopedia.com. 22 Apr. 2017 <http://www.encyclopedia.com>.

"atoll." A Dictionary of Ecology. . Encyclopedia.com. (April 22, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/atoll-0

"atoll." A Dictionary of Ecology. . Retrieved April 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/atoll-0

atoll

atoll Ring-shaped organic reef that encloses or almost encloses a lagoon, and which is surrounded by the open sea. The reef may be built of coral and/or calcareous algae. An atoll is built on an existing structure such as an extinct, submerged volcano.

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"atoll." A Dictionary of Earth Sciences. . Encyclopedia.com. 22 Apr. 2017 <http://www.encyclopedia.com>.

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"atoll." A Dictionary of Earth Sciences. . Retrieved April 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/atoll

atoll

at·oll / ˈatˌôl; ˈatˌäl; ˈāˌtôl; ˈāˌtäl/ • n. a ring-shaped reef, island, or chain of islands formed of coral.

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"atoll." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 22 Apr. 2017 <http://www.encyclopedia.com>.

"atoll." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (April 22, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/atoll-0

"atoll." The Oxford Pocket Dictionary of Current English. . Retrieved April 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/atoll-0

atoll

atoll ring-shaped coral reef enclosing a lagoon. XIX (in XVII as atollon). — Maldive atoḷu.

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"atoll." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 22 Apr. 2017 <http://www.encyclopedia.com>.

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"atoll." The Concise Oxford Dictionary of English Etymology. . Retrieved April 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/atoll-1

atoll

atoll: see coral reefs.

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"atoll." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 22 Apr. 2017 <http://www.encyclopedia.com>.

"atoll." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 22, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/atoll

"atoll." The Columbia Encyclopedia, 6th ed.. . Retrieved April 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/atoll

atoll

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"atoll." Oxford Dictionary of Rhymes. . Encyclopedia.com. 22 Apr. 2017 <http://www.encyclopedia.com>.

"atoll." Oxford Dictionary of Rhymes. . Encyclopedia.com. (April 22, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/atoll

"atoll." Oxford Dictionary of Rhymes. . Retrieved April 22, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/atoll