Image:Atoll forming.jpg
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Atoll_forming.jpg (283 × 503 pixels, taille du fichier : 21 Kio, type MIME : image/jpeg)
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Source: http://pubs.usgs.gov/fs/2002/fs025-02/
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.
Graphic Design By Susan Mayfield and Sara Boore
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This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy |
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| Date et heure | Dimensions | Utilisateur | Commentaire | |
|---|---|---|---|---|
| actuel | 17 novembre 2005 à 07:43 | 283×503 (21 Kio) | Salleman | ('''Source:''' http://pubs.usgs.gov/fs/2002/fs025-02/ '''Caption:''' Coral atolls develop from reefs fringing volcanic islands. As first hypothesized by Charles Darwin, and confi rmed by ocean drilling done by British scientists a century ago, reefs fring) |
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