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The wonderful world of coral reefs

Updated 1311 GMT (2111 HKT) March 29, 2013
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Matthew Knight/Inez Torre/CNN
Matthew Knight/Inez Torre/CNN
Matthew Knight/Inez Torre/CNN
Matthew Knight/Inez Torre/CNN
Sources: GBR Marine Park Authority/UNESCO Matthew Knight/Inez Torre/CNN
Matthew Knight/Inez Torre/CNN
Matthew Knight/Inez Torre/CNN