File:Atoll forming-Barrier reef.png

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diagram:Atoll forming. '''1'''=Volcanic Island '''2'''=Fringind reef '''3'''=Barrier reeef |Source=http://commons.wikimedia.org/wiki/Image:Atoll_forming.jpg

Fil:Atoll forming-Fringing reef.png

diagram:Atoll forming. '''1'''=Volcanic Island '''2'''=Fringind reef '''3'''=Barrier reeef |Source=http://commons.wikimedia.org/wiki/Image:Atoll_forming.jpg

Fil:Atoll forming-Atoll.png

diagram:Atoll forming. '''1'''=Volcanic Island '''2'''=Fringind reef '''3'''=Barrier reeef |Source=http://commons.wikimedia.org/wiki/Image:Atoll_forming.jpg

Fil:Atoll forming-volcano.png

diagram:Atoll forming. '''1'''=Volcanic Island '''2'''=Fringind reef '''3'''=Barrier reeef |Source=http://commons.wikimedia.org/wiki/Image:Atoll_forming.jpg

Fil:Britannica Coral-reefs Atoll Formation.png

showing the formation of an atoll during subsidence. (After C. Darwin.) The lower part of the figure represents a barrier reef surrcunding a central peak