PERMAFROST

Permafrost

In geology, permafrost or cryotic soil is soil at or below the freezing point of water for two or more years. Most permafrost is located in high latitudes, but alpine permafrost may exist at high altitudes in much lower latitudes. Ground ice is not always present, as may be in the case of nonporous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material. Permafrost accounts for 0.022% of total water and exists in 24% of exposed land in the Northern Hemisphere.

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permafrost

Noun

  1. Permanently frozen ground, or a specific layer thereof.


The above text is a snippet from Wiktionary: permafrost
and as such is available under the Creative Commons Attribution/Share-Alike License.

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