Marine Science Affairs 



Figure 11-2— Generalized Geological Cross Section of Continental Margin 



selected countries of the world which border extensive ocean areas of depths 

 less than 1,000 fathoms. 



These physical attributes of the oceans provide a partial understanding 

 of man's life; for geography affects use, and man relies on the seas for trans- 

 portation and commerce, food, fuel and minerals, recreation, waste disposal, 

 and security. 



The Great Commercial Highway 



Of all the uses of the sea, the one which is indispensable to modem society 

 IS maritime transport. Today's maritime trade routes form lifelines for the 

 exchange of raw materials and manufactured goods vital to the economy 

 of almost every nation. Additionally, a nation's merchant marine can be a 

 profitable enterprise, providing a source of wealth, earning foreign exchange, 

 and enhancmg national prestige. It can constitute a military resource and 



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