Atoll | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Atoll


00:00:42 1 Usage
00:01:43 2 Distribution and size
00:04:52 3 Formation
00:08:05 4 Investigation by the Royal Society of London into the formation of coral reefs
00:09:10 5 United States national monuments
00:09:35 6 See also



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SUMMARY
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An atoll ( , , , ,  or ), 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 or 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 upward and outward to replace the lost height.