permafrost layer

См. также в других словарях:

• permafrost — /perr meuh frawst , frost /, n. (in arctic or subarctic regions) perennially frozen subsoil. Also called pergelisol. [1943; PERMA(NENT) + FROST] * * * Perennially frozen earth, with a temperature below 32 °F (0 °C) continuously for two years or… …   Universalium

• permafrost — ► NOUN ▪ a thick subsurface layer of soil that remains below freezing point throughout the year …   English terms dictionary

• Permafrost — This article is about frozen ground. For other uses, see Permafrost (disambiguation). In geology, permafrost, cryotic soil or permafrost soil is soil at or below the freezing point of water (0 °C or 32 °F) for two or more years. Ice is not always …   Wikipedia

• Permafrost — Permafrostboden – auch Dauerfrostboden – ist ab einer gewissen Tiefe das ganze Jahr hindurch gefroren. Definitionsgemäß ist Permafrostboden „Boden, Sediment oder Gestein, welches in unterschiedlicher Mächtigkeit und Tiefe unter der Erdoberfläche… …   Deutsch Wikipedia

• permafrost — noun Etymology: permanent + frost Date: 1943 a permanently frozen layer at variable depth below the surface in frigid regions of a planet (as earth) …   New Collegiate Dictionary

• permafrost — noun ˈpɝməˌfrɔst Permanently frozen ground, or a specific layer thereof. Nevertheless, the water molecule is present, as ice, in a solid form in frozen soils or permafrosts, which cover large regions characterised by a polar climate …   Wiktionary

• permafrost — per|ma|frost [ˈpə:məfrɔst US ˈpə:rməfro:st] n [U] [Date: 1900 2000; Origin: permanent + frost] a layer of soil that is always frozen in countries where it is very cold …   Dictionary of contemporary English

• permafrost — noun a thick subsurface layer of soil that remains below freezing point throughout the year. Origin 1940s: from permanent + frost …   English new terms dictionary

• permafrost — noun (U) a layer of soil, in very cold countries, that is always frozen …   Longman dictionary of contemporary English

• permafrost —   n. layer of permanently frozen subsoil in polar regions …   Dictionary of difficult words

• active layer —   the upper few metres of soil in a periglacial area which undergoes thawing in summer and is prone to mass movement relative to the permafrost layer below …   Geography glossary