permafrost

Permanently frozen regolith, ranging in thickness from 30 centimeters to over 1000 meters.
Found on http://www.encyclo.co.uk/local/22291

permafrost

[n] - ground that is permanently frozen
Found on http://www.webdictionary.co.uk/definition.php?query=permafrost

permafrost

noun ground that is permanently frozen
Found on http://wordnetweb.princeton.edu/perl/webwn?s=permafrost

Permafrost

[story] `Permafrost` is a science fiction novelette by American writer Roger Zelazny. It won the Hugo Award for Best Novelette in 1987, and was nominated for the Nebula Award. ==Plot summary== A strange confrontation between a frozen planet, a formerly-human program, and a has-been con-man. ...
Found on http://en.wikipedia.org/wiki/Permafrost_(story)

permafrost

Click images to enlargeCondition in which a deep layer of soil does not thaw out during the summer. Permafrost occurs under periglacial conditions. It is claimed that 26% of the world's land surface is permafrost. Permafrost gives rise to a poorly drained form of grassland typical of northern Canada, Siberia, and ...
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0007771.html

permafrost

A layer of earth that is permanently frozen even though the overlaying layers may thaw.
Found on http://www.quick-facts.co.uk/earth/glossary.html

Permafrost

A soil layer below the surface of tundra regions that remains frozen permanently.
Found on http://www.encyclo.co.uk/local/22268

Permafrost

A soil layer below the surface of tundra regions that remains frozen permanently.
Found on http://www.timeanddate.com/weather/glossary.html

Permafrost

Layer of permanently frozen soil.
Found on http://www.blackwellpublishing.com/Townsend/Glossary/GlossaryP.html

permafrost

layer of soil or bedrock beneath earth's surface that is permanently frozen and has been for thousands of years.
Found on http://www.sercc.com/glossary

Permafrost

Layer of soil or rock, at some depth beneath the surface, in which the temperature has been continuously below 0
Found on http://nsidc.org/arcticmet/glossary/permafrost.html

permafrost

Perennially frozen ground that occurs wherever the temperature remains below 0 degrees C for several years.
Found on http://cdiac.ornl.gov/glossary.html

permafrost

perennially frozen ground, a naturally occurring material with a temperature colder than 0° C (32° F) continuously for two or more years. Such a ... [12 related articles]
Found on http://www.britannica.com/eb/a-z/p/46

Permafrost

Permafrost is the permanently frozen subsoil in Arctic regions.
Found on http://www.probertencyclopaedia.com/browse/AP.HTM

permafrost

permafrost, permanently frozen soil, subsoil, or other deposit, characteristic of arctic and some subarctic regions; similar conditions are also found at very high altitudes in mountain ranges. In 1962 measurements in a borehole drilled on Melville Island, Northwest Territories, Canada, showed that ...
Found on http://www.infoplease.com/ce6/sci/A0838463.html

Permafrost

Permanently frozen ground in polar regions. It forms in regions close to, but not under, ice caps, ice fields and glaciers. The frozen conditions may be several tens of metres thick, but the top layer may thaw in the summer months before freezing again in the winter. During the last Ice Age, much of southern Britain was affected by permafrost.
Found on http://www.bgs.ac.uk/discoveringGeology/glossary.html

permafrost

Permanently frozen ground, typical of the treeless plains of Siberia (tundra), though common through arctic, sub-arctic, and antarctic regions on Earth to a depth of as much as 600 meters. Permafrost also exists in the upper part of the crust on Mars.
Found on http://www.daviddarling.info/encyclopedia/P/permafrost.html

Permafrost

Permanently frozen ground.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html

permafrost

Soil conditions prevailing in area whose mean annual temperature is 0o C.
Found on http://www.ge-at.iastate.edu/glossary-of-geologic-terms/

Permafrost

Soil, rock and sediment where the temperature stays below 0°C for at least two consecutive winters and the summer in between. Permafrost usually occurs in a layer some distance beneath the topsoil.
Found on http://www.encyclo.co.uk/local/20206

Permafrost

Zone of permanently frozen water found in high latitude soils and sediments. Five types of permafrost have been recognized: continuous permafrost, discontinuous permafrost, sporadic permafrost, alpine permafrost, and subsea permafrost.
Found on http://www.physicalgeography.net/physgeoglos/p.html
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