- (in arctic or subarctic regions) perennially frozen subsoil.
Origin of permafrost
Related Words for permafrostchunk, glaze, hail, crystal, iceberg, icicle, glacier, sleet, diamonds, hailstone, permafrost, floe
Examples from the Web for permafrost
Contemporary Examples of permafrost
I wondered what would happen to the trees if some of the permafrost melted, allowing roots to expand in longer growing seasons.Visiting the Arctic Circle…Before It’s Irreversibly Changed
Terry Greene Sterling
April 1, 2014
- ground that is permanently frozen, often to great depths, the surface sometimes thawing in the summer
Word Origin for permafrost
1943, coined in English by Russian-born U.S. geologist Siemon W. Muller (1900-1970) from perm(anent) frost.
- A layer of soil or bedrock that has been continuously frozen for at least two years and as long as tens of thousands of years. Permafrost can reach depths of up to 1,524 m (4,999 ft). It is found throughout most of the polar regions and underlies about one fifth of the Earth's land surface.