San Diego, CA
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© Christine Till
The city of Chicago lies in a broad plain which, hundreds of millions of years ago, was a great interior basin covered by warm, shallow seas. These seas covered portions of North America from the Arctic Ocean to the Gulf of Mexico. One of these prehistoric proglacial lakes was Lake Chicago, the ancestor of what is now known as Lake Michigan, one of North America's five Great Lakes.
Lake Michigan is huge. With nearly 60,000 square kilometers, bigger in area than Croatia, Denmark or the Netherlands, it feels more like an ocean. On its own it would be the fourth largest freshwater lake in the world, but ombined with Lake Huron, which it is geographically a part of, it makes for the biggest freshwater lake on earth.
November 9th, 2012
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