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Water is an inorganic, transparent, tasteless, odourless, and nearly colourless chemical substance, which is that the main constituent of Earth's hydrosphere and therefore the fluids of most living organisms. it's vital for all known sorts of life, albeit it provides no calories or organic nutrients. Its formula is H2O, meaning that every of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. Water is that the name of the liquid state of H2O at standard ambient temperature and pressure. It forms precipitation within the sort of rain and aerosols within the sort of fog. Clouds are formed from suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate within the sort of snow. The gaseous state of water is steam or water vapour . Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the ocean .Water covers 71% of the surface , mostly in seas and oceans. Small portions of water occur as groundwater (1.7%), within the glaciers and therefore the ice caps of Antarctica and Greenland (1.7%), and within the air as vapour, clouds (formed of ice and liquid water suspended in air), and precipitation (0.001%).    

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