Calcium Carbonate 



275 



Fig. 7.12. World distribution of coral reefs (Ekman, 1953, after Schott) in rela- 

 tion to the 20° C isotherm for the coldest month in the year. ( Hutchins and 

 Scharff, 1947, in the /. of Marine Research. ) 



Photo R. W. Miner, Am. Museum of Nat. Hist. 



Fig. 7.13. View of coral structures at depth of 8 m on Andres Reef, Bahamas, 



