NOVA scienceNOW

Mass Extinction

Clip | 13m 14s

What caused the Permian extinction, the mother of all extinctions, 250 million years ago?

Aired: 11/01/06

Rating: TV-G

Problems Playing Video? | Closed Captioning

Funding for NOVA ScienceNOW is provided by the National Science Foundation and the Alfred P. Sloan Foundation.

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