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File:Evidence Hints at Global Glaciation 716.5 Million Years Ago (6124070168).jpg

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Two ideas exist on the progression of glaciation on Earth from 716.5 to 630 million years ago. Current evidence suggests the top version: a dynamic snowball Earth in which at least two long-lived glaciations happened during which communication between the ocean and the atmosphere was cut off. In this scenario, as CO2 built up, a hot-house effect ensued resulting in an ice-free planet at 670 and 630 million years ago. Learn more in the NSF news release.

Credit: Zina Deretsky, National Science Foundation

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Source Evidence Hints at Global Glaciation 716.5 Million Years Ago
Author National Science Foundation

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Public domain This image is a work of a National Science Foundation employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
This image was originally posted to Flickr by National Science Foundation at https://flickr.com/photos/37157086@N02/6124070168. It was reviewed on 19 January 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the United States Government Work.

19 January 2018

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current14:13, 19 January 2018Thumbnail for version as of 14:13, 19 January 20181,909 × 1,200 (487 KB)Artix Kreiger 2 (talk | contribs)Transferred from Flickr via Flickr2Commons

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