Snowball Earth, picture from NASA
- What triggers an ice age, and a period of warming? What happened 650 million years ago, when the earth became "snowball earth", covered in ice from the poles to the equator? How did it impact life? Was it a factor in the rise of multi-cellular organisms, and the ensuing Cambrian explosion?
We'll answer those questions by watching and discussing the second episode of Prehistoric Disasters: Snowball Earth from the Discovery Channel.
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