Permafrost Layer of soil or rock, at some depth beneath the surface, in which the temperature has been continuously below 0 °C for at least some years. It exists where summer heating fails to reach the base of the layer of frozen ground.
Permafrost - a permanently frozen layer of soil or bedrock at a variable depth below the surface of the earth in frigid regions ...
Permafrost
A layer of soil at varying depths below the surface in which the temperature has remained below freezing continuously from a few to several thousands of years.
Permeability ...
Permafrost- a soil layer below the surface of tundra regions that remains frozen permanently.
Partly Cloudy- the appearance of the sky when 3/10ths to 6/10ths of the sky is covered with clouds.
permafrost: layer of soil or bedrock beneath earth's surface that is permanently frozen and has been for thousands of years.
Permafrost A layer of soil beneath the earth's surface that remains frozen throughout the year.
Photodissociation The splitting of a molecule by a photon.
Permafrost See cryosphere.
Perturbations Minor corrections to the Keplerian model of a satellite orbit as an ellipse of constant shape and orientation.
Permafrost(1)
Perennially frozen ground that occurs wherever the temperature remains below 0°C for several years.
Phenology(8) ...
February 2001: Permafrost: Specter of The Great Ice Ages
March 2001: Wind Vanes: Pointing To The Wind
April 2001: From Sea Froth To Raindrops
May 2001: Another Fine Vintage
June 2001: Winds of the Day
July 2001: Hot Town: Summer in the City ...
active layer"(Also called frost zone, mollisol.) That part of the soil included with the suprapermafrost layer (i.e., existing above permafrost) that usually freezes in winter and thaws in summer.
Talik or Tabetisol These are Russian words, both used to refer to a layer of permanently unfrozen ground within regions of permafrost.
cryosphere: a component of the Earth's system that is frozen water; the forms include: snow, permafrost, floating ice, and glaciers.
It is also known as the Absolute Temperature Scale.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: Freezing Level, Frost, Frozen Dew, FRST, Melting Point, Permafrost
Also listed in ...
 See also: Temperature, Surface, Earth, Frost, Water
  
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