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A glacier is a thick mass of ice that can form over years of accumulation of snow.  Glaciers get so thick and heavy that they begin to slide across the ground.  As the glaciers melt and recede, they leave behind huge deposits of rock and sand.  Glaciers can make massive changes in the earth's surface as they slide across the ground.  The glaciers can flatten the landscape and dig out huge holes in the surface of the earth.  As the glaciers retreat, the melting water fills the holes to create lakes and ponds.  There have been at least three major ice glaciations over the millions of years changing the look of the Earth's surface each time. The Great Lakes were even formed by the repeated movement of ice glaciers.

Watch the videos below to learn more about ice glaciers!