Look up: permafrost

1. 
   Permafrost
   Permafrost is the permanently frozen subsoil in Arctic regions.
   Found on http://www.encyclo.co.uk/nol.php
   
   
2. 
   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
   
   
3. 
   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.geologyrocks.co.uk/glossary/l
   
   
4. 
   permafrost
   [n] - ground that is permanently frozen
   Found on http://www.webdictionary.co.uk/definitio
   
   
5. 
   permafrost
   permanently frozen ground or rock Category: The cosmos • Permanently frozen ground that occurs wherever ground temperatures remain continuously below 0 C for two or more years. Category: Botany and zoology
   Found on http://www.mijnwoordenboek.nl/definition
   
   
6. 
   Permafrost
   Layer of permanently frozen soil.
   Found on http://www.blackwellpublishing.com/Towns
   
   
7. 
   permafrost
   noun ground that is permanently frozen
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
8. 
   Permafrost
   In geology, `permafrost` or `permafrost soil` is soil at or below the freezing point of water (0 ðC or 32 ðF) for two or more years. 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. Most permafrost is located in high latitudes (e.g. land in close proximity to the North and South poles), but `alpine permafros...
   Found on http://en.wikipedia.org/wiki/Permafrost
   
   
9. 
   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
   
   
10. 
    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/physgeo
    
    
11. 
    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/encyclopedi
    
    
12. 
    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/A08384