'Snowball Earth:' Entire planet was likely covered in ice more than 600 million years ago - Space.com

'Snowball Earth:' Entire planet was likely covered in ice more than 600 million years ago Space.comEarth's Greatest Ice Age Really Did Bring Ice Sheets To The Equator MSNResearchers find strong evidence for “Snowball Earth” theory The Jerusalem PostMissinAds Links by Easy Branches
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