Why does iron rust in the air?

This happens because i feel like it to happen now get a life and this project is hard so think of something else i tryed im mad!!!!

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Whats iron rust?  How does air effect rust?  What gas from the air helps rust?  What polution in the air causes rust?  Why does it have to have air to rust?  If oxygen is removed from a sample of air such as iron rust what happens to the total pressure of the air?