Barrier reefs can develop into atolls as the seafloor sinks with age.

Name: Barrier reefs can develop into atolls as the seafloor sinks with age.
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Barrier reefs can become atolls when the seafloor begins to sink and the central lagoon of the reef becomes filled with sediment and coral debris, eventually becoming a shallow water island surrounded by a ring of coral reef. This process can take thousands of years.

Barrier Reefs Can Develop into Atolls as the Seafloor Sinks