Question

Explain how an island with fringing reefs can become an atoll.​

Answer 1

Explanation:

If a fringing reef forms around a volcanic island that sinks completely below sea level while the coral continues to grow upward, an atoll forms. Atolls are usually circular or oval, with a central lagoon. Depending on their size, barrier reefs and atolls can take from 100,000 to 30,000,000 years to fully form.

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Answer 2

Answer:

a fringing reef forms around a volcanic island that sinks completely below sea level while the coral continues to grow upward, an atoll forms. Atolls are usually circular or oval, with a central lagoon. ... Depending on their size, barrier reefs and atolls can take from 100,000 to 30,000,000 years to fully form.

Explanation:

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