Great Lakes

March 24, 2009
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How the Earth Was Made - S1 - E7

Great Lakes

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.

How the Earth Was Made: Season 1 - 13 Episode s


How the Earth Was Made: All seasons