dissolved silica

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• Dissolved silica — (DSi) is the form of water soluble silica as silicon hydroxide (equivalent to the old term silicic acid), which can be measured by standard analyses (e.g. Strickland and Parsons, 1972). However, The term dissolved silica is different from the… …   Wikipedia

• silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… …   Universalium

• Biogenic silica — (BSi) is the equivalent to the terms opal, biogenic opal, and amorphous opaline silica. BSi is essential to many plants and animals. Chemically, BSi is hydrated silica (SiO2• n H2O).Diatoms in both fresh and salt water extract silica from the… …   Wikipedia

• Lithogenic silica — (LSi) comes from the Greek words lithos , which means rock , and genesis , which means coming from . LSi is silica that originates from terrestrial sources of rock and soil, i.e. from silicate minerals and crystals.In the marine silicon cycle,… …   Wikipedia

• Hydrated silica — is a form of silicon dioxide, which has a variable amount of water in the formula. It is also known as silicic acid, a term usually used for its form dissolved in water. It is found in nature, as opal, which has been mined as a gemstone for… …   Wikipedia

• hydrosphere — /huy dreuh sfear /, n. the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere. [1885 90; HYDRO 1 + SPHERE] * * * Discontinuous layer of water at or near the Earth s surface. It… …   Universalium

• Sponge reef — taxobox image caption = Hexactinellae from Ernst Haeckel s Kunstformen der Natur , 1904 name = Hexactinellid Reef Sponges regnum = Animalia phylum = Porifera classis = Hexactinellida subclassis = Hexasterophora subdivision ranks = Orders… …   Wikipedia

• Spirit rover — (MER A) Artist s concept of Rover on Mars Operator NASA Mission type Rover Launch date …   Wikipedia

• glass — glassless, adj. glasslike, adj. /glas, glahs/, n. 1. a hard, brittle, noncrystalline, more or less transparent substance produced by fusion, usually consisting of mutually dissolved silica and silicates that also contain soda and lime, as in the… …   Universalium

• Chrysotile — Not to be confused with Chrysolite. Chrysotile Chrysotile serpentine from the Salt River area, Arizona General Category …   Wikipedia

• Skarn — is a metamorphic rock that is usually variably colored green or red, occasionally grey, black, brown or white. It usually forms by chemical metasomatism of rocks during metamorphism and in the contact zone of magmatic intrusions like granites… …   Wikipedia