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The Origins Podcast with Lawrence Krauss

CHAPTER

The Origins of Snowball Earth

There's two time periods around 600 to 800 million years ago and 2.2 to 2.4 billion years ago where Earth was either completely covered in ice or very nearly so. The continents had ice sheets like on Antarctica but they were at the equator and they were flowing into the ocean. We know that because we have the ability to date rocks, geologists can look at rocks and figure out if there were glaciers there.

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