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Iron chemically reacts with air and water to form rust, a porous crumbling material that sticks loosely to the iron's surface. When rust crumbles and falls away, a new place on the iron's surface is exposed: eventually the entire sample will rust away.(I am confused with the wording from the textbook).

For learning: English
Base language: English
Category: Language

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    Best Answer - Chosen by Voting
    Think of what you know about rust.
    You know that if you leave iron outside in the rain will rust.
    It's the water from the rain, and the oxygen from the air that combines chemically with the iron to form rust.
    If a piece of rust falls off and some iron is left exposed, then the whole thing will begin again.

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