. The earth and its inhabitants ... Geography. 388 AMAZONIA AND LA PLATA. shoot tliese rapids at a velocity of 12 or 15 miles an hour. The Santa Cruz is certainly the most copious of all the Patagonian rivers, and Moyano estimates its discharge at no less than 30,000 cubic feet per second. It draws all its supplies from the lakes, for the little rain that falls farther east is absorbed in the sur- roundins: volcanic scoriae. Its channel and the lateral terraces are strewn with erratic boulders, huge masses of 17,000 or 18,000 cubic feet. Assuming that in the Upper Santa Cruz valley the average
. The earth and its inhabitants ... Geography. 388 AMAZONIA AND LA PLATA. shoot tliese rapids at a velocity of 12 or 15 miles an hour. The Santa Cruz is certainly the most copious of all the Patagonian rivers, and Moyano estimates its discharge at no less than 30,000 cubic feet per second. It draws all its supplies from the lakes, for the little rain that falls farther east is absorbed in the sur- roundins: volcanic scoriae. Its channel and the lateral terraces are strewn with erratic boulders, huge masses of 17,000 or 18,000 cubic feet. Assuming that in the Upper Santa Cruz valley the average annual rainfall amounts to about 30 inches, a figure which seems approximately correct, the superficial area of a catchment basin necessarv for the development of such a stream Fig. 158.—Moirnis op the Rios Chico and Santa Cruz. Scale 1 ; 1,100,000. r" 50' V f. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Reclus, Elisée, 1830-1905; Ravenstein, Ernest George, 1834-1913; Keane, A. H. (Augustus Henry), 1833-1912. New York, D. Appleton and company
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