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Rust forms because iron and oxygen are highly elements

User Bleepmeh
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Rust does form when iron and oxygen are in contact. It shows up on iron and any kind of metal when it is exposed to air and moisture aka: oxygen and water.




User Blokkie
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Answer:

The answer is : Reactive

Step-by-step explanation:

Because the water molecules in the air get on the metal and rust it but copper and softer metals rust easier.

User Janis Peisenieks
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