Permafrost

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• permafrost — [ pɛrmafrɔst ] n. m. • 1956; mot angl. amér. (1946), de perma(nent) et frost « gel » ♦ Géogr. Sol perpétuellement gelé des régions arctiques. « Les Esquimaux creusaient un trou dans le “permafrost” et gardaient la viande dans ces réfrigérateurs… …   Encyclopédie Universelle

• permafrost — PERMAFRÓST s.n. (geol.) Strat de sol şi de roci care nu se dezgheaţă nici în timpul verii; pergelisol. [cf. germ. Permafrost, fr. permafrost]. Trimis de LauraGellner, 22.07.2005. Sursa: DN  PERMAFRÓST s.n. Strat de sol îngheţat permanent;… …   Dicționar Român

• Permafrost — opstår, hvis sommervarmen ikke formår at hæve temperaturen i jorden til ovre frysepunktet og at der derfor er et frostlag i en eller anden dybde året rundt. Permafrost er normal i områder, hvor årsmiddeltemperaturen er under 2°C. Visse steder som …   Danske encyklopædi

• permafrost — / pə:məfrɑst/, it. / pɛrmafrɔst/ s. ingl. [comp. di perma(nent ) permanente e frost gelato ], usato in ital. al masch. (geol.) [strato di terreno permanentemente gelato che si trova sotto la superficie terrestre, spec. alle alte latitudini]… …   Enciclopedia Italiana

• permafrost — (n.) 1943, coined in English by Russian born U.S. geologist Siemon W. Muller (1900 1970) from perm(anent) frost …   Etymology dictionary

• permafrost — pȅrmafrost m DEFINICIJA geol. trajno zamrznuto tlo što nastaje pri temperaturi koja je tijekom više godina ispod ništice ETIMOLOGIJA engl. perma (nent) frost: vječni led …   Hrvatski jezični portal

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

• permafrost — [pʉr′mə frôst΄] n. [ PERMA(NENT) + FROST] permanently frozen soil, subsoil, etc …   English World dictionary

• 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 — 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