. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. The Great Lakes 63 Clark Reservation one may see today a series of abandoned cataracts, dry rock channels and plunge basins. Green Lake at present occupies one of these old plunge basins, its waters, perhaps a hundred feet deep, are surrounded on all sides but one, by sheer limestone cliffs nearly two hundred feet high. When lakes become populated then the plants and animals living in the water and about the shore line contribute their remains to the final filling of the basin
. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. The Great Lakes 63 Clark Reservation one may see today a series of abandoned cataracts, dry rock channels and plunge basins. Green Lake at present occupies one of these old plunge basins, its waters, perhaps a hundred feet deep, are surrounded on all sides but one, by sheer limestone cliffs nearly two hundred feet high. When lakes become populated then the plants and animals living in the water and about the shore line contribute their remains to the final filling of the basin. This is well shown in figure 13. The Great Lakes con- stitute the most magnifi- cent system of reservoirs of fresh water in the world; five vast inland seas, whose shores have all the sweep and majesty of the ocean, no land being visi- ble across them. All but one (Erie) have the bot- tom of their basins below the sea level. Their area, elevation and depth are as follows:. Fig. 14. The larger lakes and rivers of North America. Area in Surface Depth in feet sq. mi. alt. in ft. meant maximum Lake Ontario 7-24o 247 300 738 " Erie 9-960 573 70 210 " Htiron* 581 250 730 " Michigan 581 325 870 " Superior 602 475 *Including Georgian Bay. tApproximate. They are stated by Russell to contain enough water to keep a Niagara full-flowing for a hundred 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 Needham, James G. (James George), 1868-1956; Lloyd, John Thomas, 1884- joint author. Ithaca,N. Y. , The Comstock Publishing Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1915
