An atoll is a ring-shaped coral reef.

Name: An atoll is a ring-shaped coral reef.
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An atoll is indeed a ring-shaped coral reef. It is formed from coral and other calcium carbonate structures that accumulate on top of a submerged volcano or seamount. As the volcano sinks or erodes, the coral continues to grow upward, forming a ring-shaped reef around a lagoon. Atolls are commonly found in tropical and subtropical regions of the world.

An Atoll Is a Ring-Shaped Coral Reef