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Once blue ice is exposed to warmer air, cracks and fissures appear in surface layers, and break up the large blue crystals of dense, pure ice. Within hours these air filled fissures cloud the surface making the ice appear white. The blue colour will not be seen again until the ice breaks or turns over to expose ice which air could not reach.
Blue iceberg observed by tourists along the coast of Alaska, 2010. A blue iceberg is visible after the ice from above the water melts, causing the smooth portion of ice from below the water to overturn. [1] [2] The rare blue ice is formed from the compression of pure snow, which then develops into glacial ice. [3] [4]
The most obvious glacial feature in Illinois is Lake Michigan, the basin of which was carved out by glaciers. [6] As the glaciers receded they left a large number of recessional moraines; among the more visible moraines in the state is the Bloomington Moraine, a Wisconsinan terminal moraine that can be seen in Bureau County.
The Illinoian Stage is the name used by Quaternary geologists in North America to designate the Penultimate Glacial Period c.191,000 to c.130,000 years ago, during the late Middle Pleistocene (Chibanian), when sediments comprising the Illinoian Glacial Lobe were deposited.
Illinois experienced its main periods of glaciation over the past 1.8 million years. These glaciers filled in the Mahomet River valley. [18] The melting glaciers transported large amounts of sediment that filled in the original course of the Mississippi River, which took on its modern course. Other glacial melt water went on to form large lakes ...
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The Laurentide ice sheet (LIS) was a massive sheet of ice that covered millions of square miles, including most of Canada and a large portion of the Northern United States, multiple times during the Quaternary glaciation epochs, from 2.58 million years ago to the present.
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