snowball schneeball erde thawing skies earthly beyond atmosphere
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earth snowball ice age planet science life made
earth snowball life complex planet fats fossil algae years evolution led phase after million ago explosion appears growth survived our
snowball clouds thaw earthsky covered fullerton nuclear entirely proponents geology
rodinia earth snowball mya break supercontinent reconstruction planet dispersal frozen september li figure earthly skies beyond
earth skies earthly beyond impression exoplanet richard scott credit artist figure like
snowball earth ice covered time hypothesis last stages might been researchers open crust layer suggest blamed missing storm led fire
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