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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.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.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.ask.com/youtube?q=Formation+of+Coral+Atolls&v=pRD8ZwdPYsY
Mar 25, 2015 ... Atolls begin as an underwater volcanoes called seamounts. ... the volcano goes dormant and sinks, but the coral reefs remain and ... I grew up in Australia, but my home Island is in Maldives and apparently it was also formed ...
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 ...

pauillac.inria.fr/~clerger/Darwin.html

No theory on the formation of coral-reefs can be considered satisfactory which does not include the three classes. We have seen that we are driven to believe in  ...

www.upi.com/blog/2013/05/16/Charles-Darwin-wrong-about-coral-atoll-evolution/1051368711681

May 16, 2013 ... New research reveals Darwin's theory on the formation of coral atolls was on the right track, but underestimated the complexity of the reef ...