An artist's conception of "Snowball Earth," when the planet was either completely or ... physical evidence that Snowball Earth reached the heart of continents at the equator," Liam Courtney ...
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'Snowball Earth:' Entire planet was likely covered in ice more than 600 million years agoBut they've argued quite a bit about just how icy the planet got — specifically ... the first physical evidence that Snowball ...
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