Water (chemical formula: H2O) is a clear fluid which forms the globe s streams, lakes, oceans and rain, and is the major constituent of the fluids of microorganisms. As a chemical substance, a water molecule includes one oxygen and 2 hydrogen atoms that are linked by covalent bonds. Water is a fluid at typical ambient temperature [ ]
http://worldgeographicchannel.com/natures-precious-elixir-water-documentary-films/
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