When it was created, the Earth included a tiny per...
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Length: 44:52
Posted: 5/3/2012
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Why do we have ice ages and when is the next one d...
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Length: 43:50
Posted: 1/1/0001
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In Siberia 250 million years ago, huge volumes of ...
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Length: 44:13
Aired: 2/9/2010
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Once thought to be dormant, Mount St. Helens is an...
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Length: 45:02
Aired: 2/2/2010
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It is a place of natural splendor and a geologic t...
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Length: 44:11
Aired: 1/26/2010
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It is the tallest mountain on earth, as far remove...
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Length: 44:12
Aired: 1/19/2010
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Nearly 25,000 miles long, the Ring of Fire circles...
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Length: 44:11
Aired: 1/12/2010
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The Rockies are one of the world's great mountain ...
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Length: 43:56
Aired: 12/22/2009
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The Sierra Nevada, North America's highest mountai...
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Length: 44:32
Aired: 12/22/2009
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An astonishing series of geological discoveries ha...
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Length: 45:02
Aired: 12/15/2009
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This episode travels back in time to investigate h...
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Length: 44:12
Aired: 12/8/2009
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Mount Vesuvius is the world's most dangerous volca...
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Length: 44:12
Aired: 12/1/2009
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Almost 200 miles long and over a mile deep, this d...
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Length: 44:12
Aired: 11/24/2009
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Through ancient clues and expert analysis, this na...
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Length: 10:20:00
Posted: 1/1/0001
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The jagged backbone of Europe, the Alps are Europe...
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Length: 44:53
Aired: 1/24/2012
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Emerging in the center of the Pacific Ocean, the H...
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Length: 44:52
Aired: 5/5/2009
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