Answer: corrosion
Notes: Rusting is a process of slow oxidation of iron by atmospheric oxygen in presence of moisture. It is only oxidation, it is not combustion. Combustion is rapid oxidation by oxygen with the liberation of heat. Rusting is the common term for corrosion of iron. Corrosion is a natural process that converts a refined metals into a more chemically stable form such as oxide, hydroxide etc.
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