Explain the term "corrosion" with an example. Write a chemical equation to show the process of corrosion of iron.

Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide. Rusting of iron metal is the most common form of corrosion.

Iron metal in presence of moisture and oxygen froms Hydrated iron oxide which is called rust.