The National Geographic Magazine, Volume 92National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page 406
... tion of a second by timing the echo of a high- pitched sound sent down to the bottom and back . Knowing the speed of sound in water , 4,938 feet a second , a skipper can tell within a fraction of an inch how deep the water is . Tiny ...
... tion of a second by timing the echo of a high- pitched sound sent down to the bottom and back . Knowing the speed of sound in water , 4,938 feet a second , a skipper can tell within a fraction of an inch how deep the water is . Tiny ...
Page 478
... tion , and cools below the surface . Then , The picture taken from more than 1,000 feet through the years , the processes of erosion eat in the air was not dissimilar to that of a vege- away the softer surface rocks overlying them ...
... tion , and cools below the surface . Then , The picture taken from more than 1,000 feet through the years , the processes of erosion eat in the air was not dissimilar to that of a vege- away the softer surface rocks overlying them ...
Page 524
... tion in scale . Since all parts of the map lie perishable tropical delicacies now are flown to within 15 degrees of this line , the scale varia- United States markets . tion is slight , reaching a maximum of 372 One cargo of specially ...
... tion in scale . Since all parts of the map lie perishable tropical delicacies now are flown to within 15 degrees of this line , the scale varia- United States markets . tion is slight , reaching a maximum of 372 One cargo of specially ...
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