The foundation of the Great Lakes began around three billion years ago, which is known as the Precambrian Era. The Precambrian Era contains numerous ecological events, which consists of volcanic activity to erosion to the mountains and hills seen today being formed. Then during the Pleistocene Epoch or known as the “Ice Age, occurred between 1.6 million and 10,000 years ago. At least four times during the Pleistocene Epoch, large masses of ice advanced and retreated over the surface of what is now North America. As the glaciers advanced, giant sheets of ice flowed across the land, leveling mountains and carving out massive ...
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"TEACH Geography: How the Lakes Were Formed."TEACH Geography: How the Lakes Were Formed. N.p., n.d. Web. 28 Mar. 2014.
Zimmermann, Kim Ann. "Lake Huron Facts."LiveScience. TechMedia Network, 16 May 2013. Web. 29 Mar. 2014a.
Zimmermann, Kim Ann. "Lake Erie Facts."LiveScience. TechMedia Network, 17 May 2013. Web. 30 Mar. 2014b.
Zimmermann, Kim Ann. "Lake Michigan Facts."LiveScience. TechMedia Network, 14 May 2013. Web. 27 Mar. 2014c.
Zimmermann, Kim Ann. "Lake Superior: Facts About the Greatest Lake."LiveScience. TechMedia Network, 13 May 2013. Web. 29 Mar. 2014d.
Zimmermann, Kim Ann. "Lake Ontario Facts."LiveScience. TechMedia Network, 21 May 2013. Web. 30 Mar. 2014e.
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