Journey to the Earth's Core

1h 28min | Aired on Mar 23, 2011 | TV-PG | CC |

Humans have mapped every corner of the globe--from jungles to deserts, even outer space. Yet we've gone only 7 miles below the Earth's surface--just 1/500th of the way to the Core. Go deeper into the heart of our planet: 4,000 miles down.

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