Paleontologist Kirk Johnson visits the Grand Canyon and Niagara Falls to explore how various primordial geological forces including volcanoes, earthquakes, floods and glaciers shaped the continent that came to be North America. Tom Ciampoli, Rovi
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Paleontologist Kirk Johnson visits the Grand Canyon and Niagara Falls to explore how various primordial geological forces including volcanoes, earthquakes, floods and glaciers shaped the continent that came to be North America. Tom Ciampoli, Rovi
Read Less