Definitions for permafrostˈpɜr məˌfrɔst, -ˌfrɒst
This page provides all possible meanings and translations of the word permafrost
Random House Webster's College Dictionary
per•ma•frostˈpɜr məˌfrɔst, -ˌfrɒst(n.)
(in arctic or subarctic regions) permanently frozen subsoil.
Category: Geography (terms)
Origin of permafrost:
1943; perma (nent ) frost
ground that is permanently frozen
Permanently frozen ground, or a specific layer thereof.
In geology, permafrost or cryotic soil is soil at or below the freezing point of water 0 °C 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. A global temperature rise of 1.5 °C above current levels would be enough to start the melting of permafrost in Siberia, according to one group of scientists.
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