. Biology and human life. Biology. 552 BIOLOGY AND HUMAN LIFE only source of energy that is constantly renewing itself at a sufficiently rapid rate; but to maintain the service of waterfalls we must be sure of the steadiness of the water supply, and this in turn depends upon the forest/ 396. Soil and forests. Every year the streams and rivers carry down to the sea a quantity of earth estimated to be. Fig. 225. An eroded slope in western North Carolina On slopes from which the vegetation has been removed the rains and melting snows produce destructive effects of great practical importance. (Fro
. Biology and human life. Biology. 552 BIOLOGY AND HUMAN LIFE only source of energy that is constantly renewing itself at a sufficiently rapid rate; but to maintain the service of waterfalls we must be sure of the steadiness of the water supply, and this in turn depends upon the forest/ 396. Soil and forests. Every year the streams and rivers carry down to the sea a quantity of earth estimated to be. Fig. 225. An eroded slope in western North Carolina On slopes from which the vegetation has been removed the rains and melting snows produce destructive effects of great practical importance. (From photograph by United States Bureau of Forestry) worth over a billion dollars. This is not only a direct loss of agricultural resource; it also interferes with the navigation of streams and with the conditions of harbors. Millions of dollars are spent every year dredging harbors in this country, to remove ^ When we burn coal as fuel, we are of course again dependent upon the forest (though not the forest of our own times), since all coal consists of the modified remains of ancient 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company
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