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Internationalization of the diagram:Atoll forming.
1=Volcanic Island
2=Fringing reef
3=Barrier reeef

Caption: Coral atolls develop from reefs fringing volcanic islands. As first hypothesized by Charles Darwin, and confirmed by ocean drilling done by British scientists a century ago, reefs fringing volcanic islands build vertically to sea level, forming steepwalled barrier reefs. As a volcanic island subsides, or sinks, with time, the growing reef keeps pace with the rising water level. When the island eventually submerges, the ring-shaped reef forms an atoll with a central lagoon.
Ffynhonnell http://commons.wikimedia.org/wiki/Image:Atoll_forming.jpg
Awdur Susan Mayfield and Sara Boore, modified by Eurico Zimbres
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(Ailddefnyddio'r ffeil hon)		 Free for all use
Diwygiadau eraill

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This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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cyfredol18:32, 29 Mai 2006Bawdlun y fersiwn am 18:32, 29 Mai 20061,667 × 2,423 (486 KB)Zimbres{{Information |Description= Internationalization of the diagram:Atoll forming.<br> '''1'''=Volcanic Island<br> '''2'''=Fringind reef<br> '''3'''=Barrier reeef<br> |Source=http://commons.wikimedia.org/wiki/Image:Atoll_forming.jpg |Date= |Author=USGS/USGov

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