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What Is a Glacier? Types Of Glaciers

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Glaciers What Is a Glacier? Glaciers are made up of fallen snow that over many years compresses into large thickened ice masses. Glaciers form when snow remains in one location long enough to transform into ice. Glaciers also have the ability to move. Because of their sheer mass, glaciers flow like very slow rivers; some glaciers are as small as football fields, while others grow to be over a hundred kilometres long. At the moment glaciers hold 10% of the world's total land area, and most of them are located in Polar Regions like Antarctica and Greenland. Glaciers begin to form when snow remains in the same area for a year round when there is enough snow it accumulates then to transforms into ice. Each year, new layers of snow bury and compress the previous layers; this compression forces the snow to re-crystallize, which form small grains same as shape and size of grains of sugar. ...read more.


Valley glaciers may be very long, often flowing down beyond the snow line and sometimes reaching sea level. Piedmont Glaciers- They occur when steep valley glaciers spill into flat plains, where they spread out. Cirque Glaciers- They are found high on mountainsides and tend to be wide rather than long. Hanging Glaciers- These glaciers cling to steep mountainsides. Like cirque glaciers, they are wider than they are long. Hanging glaciers are common in the Alps, where they often cause avalanches due to the steep inclines they have. Tidewater Glaciers- They are valley glaciers that flow far enough to reach out into the sea. How Glaciers Affect Land? Glaciers don't just transport material as they move, but they also sculpt and carve away the land beneath them. A glacier's weight, combined with its movement, can drastically reshape the landscape. Over hundreds or even thousands of years, the ice changes the landscape. The ice erodes the land surface and carries the broken rocks and soil far from their original places, which results with glacial landforms. ...read more.


These streams deposit the debris as they flow. Kettle lakes form when a piece of glacier ice breaks off and becomes buried by glacial till or moraine deposits. Over time the ice melts, leaving a small depression in the land, filled with water. Glaciers leave behind anything they pick up along the way, and sometimes this includes huge rocks. Drumlins are long, tear drop shaped sedimentary formations. What caused drumlin to form is poorly understood, but scientists believe that they were created sub glacially as the ice sheets moved across the landscape during the various ice ages. Theories suggest that drumlins might have been formed as glaciers scraped up sediment from the underlying ground surface, or from erosion or deposition of sediment by glacial melt water, or some combination of these processes. Because the till, sand and gravel that form drumlins, are deposited and shaped by glacier movement, all drumlins created by a particular glacier face the same direction, running parallel to the glacier's flow. ?? ?? ?? ?? Nour Hroub 10R ...read more.

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