thermokarst mound

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• Semyonovsky Island — ( о. Семёновский in Russian) was an island in the southwest part of the New Siberian Islands in the eastern part of the Laptev Sea. Before its destruction, it was at 4 sq. km, one of the smallest islands in the archipelago. In 1945, just before… …   Wikipedia

• 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

• Oxia Palus quadrangle — Quadrangle map of Oxia Palus labeled with major features. This quadrangle contains many areas of chaotic terrain and many outflow channels (old river valleys) The Oxia Palus quadrangle is one of a series of 30 quadrangle maps of Mars used by the… …   Wikipedia