Birth of America ()

AKA:
National Geographic Naked Science: Birth of America

Synopsis:
The shape of the North American continent has changed radically over millions of years. During the great Ice Age, glaciers carved out the Great Lakes; as the Earth's temperature rose, they filled with glacier melt. The Great Salt Lake is just a shadow of its former self. And as tectonic plates continue to move, America moves closer to Europe each year.
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