Time Travel in the Grand Canyon
Clip: Season 42 Episode 20 | 4m 33s
What does this geological wonder reveal about North America’s deep history?
Aired: 11/04/15
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Clip: Season 42 Episode 20 | 4m 33s
What does this geological wonder reveal about North America’s deep history?
Aired: 11/04/15
Problems Playing Video? | Closed Captioning