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An atoll sometimes called a coral atoll, is a ring-shaped coral reef including a coral rim that encircles a lagoon partially or completely.


This animation shows the dynamic process of how a coral atoll forms. Corals ( represented in tan and purple) begin to settle and grow around an oceanic island  ...


NOAA Ocean Service Oceans Education: How Do Coral Reefs Form? ... Diagram of coral atoll formation. Corals usually develop into one of three characteristic ...

Mar 25, 2015 ... Atolls begin as an underwater volcanoes called seamounts. ... than the island sinks, eventually creating an island ring made of coral around a ...


May 13, 2013 ... Sea-level rise is more important than sinking islands in shaping coral atolls, a study finds, meaning Darwin was wrong about how atolls form.


Atolls, which are circular islands or archipelagos located around a central ... of a volcanic island is worn away, leaving behind only the coral reef that formed at...


Atolls begin as fringing reefs surrounding a volcanic island (Darwin 1842). ... Hatcher explains that these basic truths of coral atoll formation and structure have  ...


Atoll. coral reef. Written By: The Editors of Encyclopædia Britannica ... Atoll, coral reef enclosing a lagoon. ... Diagram depicting the process of atoll formation.


Sometimes they completely surround an island, forming what is known as a barrier reef. In other cases, there is no island at all, just a strip of coral ringing a body ...


An atoll develops from a coral reef that rings a volcanic island.