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Rust is typically thought of as the orange-brown flakes that form on an exposed steel surface when iron molecules in the metal react with oxygen in the presence of water to form iron oxides. Rust is caused by the reaction of iron molecules in the metal with oxygen in the presence of water. Iron molecules in the metal react with oxygen when exposed to water, causing rust to form on the surface of the metal. When exposed to water, the iron molecules in the metal react with the oxygen in the air, causing rust to form on the surface of t... more