Genre: Documentary, Science, History
Premise: Historical clues and the expertise of geologists reveal how powerful forces shaped the planet; each episode examines a single location, such as the San Andreas Fault and Yellowstone National Park.
S01, E07 (First Aired: Mar. 24, 2009)
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.
S02, E05 (First Aired: Dec. 22, 2009)
Stretching from Alaska to New Mexico, the Rockies rank as one of the great mountain belts of the world and they are relatively young and still growing.
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