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Nature 433, 115 (13 January 2005) | doi:10.1038/433115a; Published online 12 January 2005

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Palaeoclimate:  Ripples of stormy weather

Heike Langenberg

According to the 'snowball Earth' hypothesis, our planet was almost entirely covered by ice at least twice in the Neoproterozoic era, between about 710 and 635 million years ago. This deep-freeze climate would have destroyed most of the budding life that existed before the ensuing Cambrian explosion of organisms.

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