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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 ...

www.ask.com/youtube?q=Formation+of+Coral+Atolls&v=pRD8ZwdPYsY
Mar 25, 2015 ... Atolls begin as an underwater volcanoes called seamounts. ... island sinks, eventually creating an island ring made of coral around ... I grew up in Australia, but my home Island is in Maldives and apparently it was also formed ...

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.ask.com/youtube?q=Formation+of+Coral+Atolls&v=vrD1O5hex6Y
May 23, 2011 ... not at all how an Island is formed; rather, how the atoll is formed. The Island is created when meteoric freshwater is trapped in the interstices of ...

www.nationalgeographic.org/encyclopedia/atoll

Aug 28, 2012 ... In the final stage of an atoll's formation, ocean waves break apart pieces of the limestone reef. They pound, break, and erode the coral into tiny ...

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...

www.nature.com/scitable/blog/saltwater-science/what_are_coral_atolls_made

Aug 9, 2016 ... The original understanding of atoll formation is attributed to Charles Darwin, who reasoned that atolls are remnants of fringing reefs that once ...