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the sphere or region of the Earth that consists of water, which is found as liquid water (surface and underground), ice (polar ice, icebergs and ice in frozen soil layers called permafrost), and water vapour in the atmosphere.
the reactant that is completely consumed and determines how much product can be formed.
a chemical reaction in which a substance reacts to form two or more simpler substances.
the electrons in the outermost occupied shell of an atom.