См. также в других словарях:
clay mineral — any of a group of hydrous aluminum silicate minerals, as kaolinite, illite, and montmorillonite, that constitute the major portion of most clays. [1945 50] * * * Any of a group of important hydrous aluminum silicates with a layered structure and… … Universalium
igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary … Universalium
Polystrate fossil — [ Nova Scotia, Canada (printed 1868).] Polystrate or upright fossil describes fossils of single organisms (such as tree trunks) that run through more than one geological strata. Entire fossil forests have been discovered [… … Wikipedia
List of lakes in Minnesota — This is a list of lakes in Minnesota. Minnesota is known as The Land of 10,000 Lakes, but the official count of lakes more than ten acres (40,000 m²) in size is approximately 11,842.[1] All but four Minnesota counties (Mower, Olmsted, Pipestone… … Wikipedia
Mass wasting — at Palo Duro Canyon, West Texas (2002) … Wikipedia
Lake Murray (South Carolina) — Infobox lake lake name = Lake Murray image lake = Lake murray willow.jpg caption lake = western side image bathymetry = caption bathymetry = location = South Carolina coords = coord|34.065795|N|81.328968|W|type:waterbody region:US… … Wikipedia
Nevado del Ruiz — La Mesa de Herveo Steam on the mountain in July 2007 Elevation … Wikipedia
calcite — calcitic /kal sit ik/, adj. /kal suyt/, n. one of the commonest minerals, calcium carbonate, CaCO3, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc spar. [1840 50; CALC + ITE1] * * * Most… … Universalium
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
siltstone — /silt stohn /, n. Petrog. a very fine grained sandstone, mainly consolidated silt. [1925 30; SILT + STONE] * * * Hardened sedimentary rock that is composed primarily of angular silt sized particles (see silt) and that is not laminated or easily… … Universalium
valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system … Universalium
