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Scientists seek clues to the formation of North America's Great Lakes, the largest expanse of fresh water on the planet; delving into an underground salt mine; investigating a fossilized coral reef; diving to the bottom of Lake Superior.
Runtime: 45:14 minutes
Quality: HD
First Air Date: Feb 10, 2009
Last Air date: Mar 02, 2010
Episode: 26 Episode
Season: 2 Season
IMDb: 3.4
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