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Horizon :: Snowball Earth (37x07)
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Episode Information |
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| Title: | Snowball Earth |
| Episode #: | 37x07 |
| Original Airdate: | Thursday February 22nd, 2001 |
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| | Episode Crew | | Director: | (Unknown) | | Writer: | (Unknown) |
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Episode Summary |
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There is a controversial theory that for millions of years the Earth was entirely smothered in ice, up to one kilometer thick. The temperature hovers around -40ºC everywhere, even in the tropics and the equator. If it did, then virtually nothing could survive this ferocious climate. There are some tantalizing geological clues that show this theory may be true but the problem is, the clues and the Snowball Earth theory defy the laws of nature.
Source: bbc
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