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date: 22 January 2020

Snowball Earth 

A Dictionary of Geography

Susan Mayhew

This theory posits that, several times in Earth’s history, oceans froze, ice sheets covered the tropics, and global temperatures plummeted to −50°C, so that the entire Earth may have actually frozen over, resembling a ‘snowball’, and potentially causing some of the most severe crises in the history of life on the planet. Such episodes may have been triggered by a reduction in greenhouse gases in the atmosphere, principally CO... ...

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