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en.wikipedia.org/wiki/Atoll

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

oceanservice.noaa.gov/education/kits/corals/media/supp_coral04a.html

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  ...

oceanservice.noaa.gov/education/kits/corals/coral04_reefs.html

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

.ask.com/youtube?q=Formation+of+Coral+Atolls&v=pRD8ZwdPYsY
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 ...

www.livescience.com/31975-how-coral-atolls-form.html

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.

www.reference.com/pets-animals/atoll-formed-4736f05efce291ce

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...

earthobservatory.nasa.gov/Features/Maldives/maldives2.php

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

www.britannica.com/science/atoll

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

www.blc.arizona.edu/courses/schaffer/182/DarwinReef.htm

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 ...

www.nationalgeographic.org/photo/atoll-formation

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