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单词 Atoll reef
释义

Atoll reef

英语百科

Atoll

Satellite picture of the Atafu atoll in Tokelau in the Pacific Ocean
NASA satellite image of some of the atolls of the Maldives, which consists of 1,322 islands arranged into 26 atolls.
Nukuoro from space. Courtesy NASA.
Los Roques Archipelago in Venezuela, the largest marine National Park in Latin America,[9]  from space. Courtesy NASA.

An atoll (/ˈætɒl/, /ˈætɔːl/, /ˈætl/, /əˈtɒl/, /əˈtɔːl/ or /əˈtl/), sometimes called a coral atoll, is a ring-shaped coral reef including a coral rim that encircles a lagoon partially or completely. There may be coral islands/cays on the rim. The coral of the atoll often sits atop the rim of an extinct seamount or volcano which has eroded or subsided partially beneath the water. The lagoon forms over the volcanic crater or caldera while the higher rim remains above water or at shallow depths that permit the coral to grow and form the reefs. For the atoll to persist, continued erosion or subsidence must be at a rate slow enough to permit reef growth upwards and outwards to replace the lost height.

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