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Permafrost
Permafrost is ground (soil or rock and included ice and organic material) that remains at or below 0 degrees C for at least two consecutive years.1
Footnotes
1. Van Everdingen, R. (ed.): 1998. Multi-Language Glossary of Permafrost and Related Ground-Ice Terms, revised May 2005. National Snow and Ice Data Center/World Data Center for Glaciology, Boulder, CO, http://nsidc.org/fgdc/glossary/.
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