National Geographic: Amazing Planet

Season 1 Episode 3

Destructive Forces

Aired Tuesday 9:00 PM Feb 21, 2007 on National Geographic
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Episode Summary

Why do mountains triangular in shape? How much rain must fall to start a river? How does one grain of sand become an entire dune? Join National Geographic as we explore how our Amazing Planet is sculpted. But hold on tight, this is no ordinary view.

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