Having grown up in Wisconsin, I've heard a lot about the Great Lakes. That being said, a new question was brought to mind during class the other day. In class we were learning about how lakes were formed, and that made me wonder what it was that carved out these massive lakes.
http://www.greatlakesnorthamerica.com/howthegreatlakes.html
The site above is what I used to find my information.
According to this site, the primary cause for the formation of these lakes is glacial erosion. Around 14,000 years ago, the Lauren Tide (a mass of glaciers covering most of Canada and northern parts of the US), started to shift to the South as the climate warmed and they continued to melt and refreeze. Eventually the glaciers carved out the massive indentations that would slowly (via rain and the glacier melting as it passed) fill with water and become the Great Lakes that we now know.
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