Map of northern hemisphere permafrost extent

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Permafrost is land in which the mean annual temperature has been below freezing for at least two years.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Modeling Earth Systems:Student Materials.

Image 51184 is a 906 by 1388 pixel JPEG
Uploaded: Nov20 14

Last Modified: 2016-08-17 11:14:29
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This map comes from a USGS website: linked to from the following page:
This item is in the public domain
and maybe reused freely without restriction.