. A complete geography. Fig. Fig. hummocks in a moraine formed by the Great Glacier near Ithaca, glacier melted, forming a great mass called a moraine (Figs. 13 and 14).The moraine hills, or hummocks, of gravel and clay were often built to aheight of one or two hundred feet. After standing for a while and building a moraine in one place, theglacier front often advanced to the soutli, or melted away toward the north,building up other irregular piles of moraine hummocks. During the thousands of years that the glacier lasted, it carriedmillions of tons of clay and rock from one
. A complete geography. Fig. Fig. hummocks in a moraine formed by the Great Glacier near Ithaca, glacier melted, forming a great mass called a moraine (Figs. 13 and 14).The moraine hills, or hummocks, of gravel and clay were often built to aheight of one or two hundred feet. After standing for a while and building a moraine in one place, theglacier front often advanced to the soutli, or melted away toward the north,building up other irregular piles of moraine hummocks. During the thousands of years that the glacier lasted, it carriedmillions of tons of clay and rock from one place to another and built PHYSIOGRAPHY OF NORTH AMERICA 11 many low liills. As it slipped over the surface, it ground bouldersand pebbles together and rubbed them against the solid rock, scratch-ing and grooving it (Fig. 15). Scratches thus made may still beseen pointing northward, toward the place from which the glaciermoved. This work of rasping, digging, carrying, and dumping doneby the glacier has led to its being compared t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgeograp, bookyear1902
