An atoll is a coral island or series of coral islands forming a ring that partially or completely encloses a shallow lagoon. Atolls are surrounded by deep ocean water and range in diameter from about 1 km to over 100 km. They are common in the western and central Pacific Ocean. Atolls are formed along the fringes of underwater volcanoes.
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| Satellite picture of the Atafu atoll in Tokelau in the Pacific Ocean. [image source: http://en.wikipedia.org/wiki/Atoll] |
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