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Hydrogen-iconOxygen-iconHydrogen-icon Waterball is a transparent and nearly colorless chemical substanceball that is the main constituent of Earthball's streams, lakes, and oceans, and the fluids of most living organisms. Its chemical formula is H2O, meaning that its molecule contains one Oxygen-icon oxygenball atom and two Hydrogen-icon hydrogenball atoms, that are connected by covalent bonds.