The Snowball Earth is a geohistorical hypothesis proposing that during one or more of Earth's icehouse climates, the planet's surface was nearly entirely frozen, with little or no liquid water exposed. This global glaciation hypothesis is most commonly associated with the Cryogenian Period, which included two major glacial episodes: the Sturtian and Marinoan.

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Facts from Wikidata (CC0). Image by Oleg Kuznetsov - 3depix - http://3depix.com/ via Wikimedia Commons (CC BY-SA 4.0).

Snowball Earth

worldwide glaciation episodes during the Cryogenian Period of the Neoproterozoic Era

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