Rusting

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Almost all metals react with oxygen and water in the air, this is known as corrosion.  When iron corrodes it is called rusting only iron can rust.

Objects made from iron or steel rust when they are in contact with both oxygen and water.  Rust is hydrated iron (III) oxide.  Iron and steel objects will not rust if they are only in contact with water or oxygen.  To speed up rusting salt

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