Question

What is rust ?
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Answer 1

Answer:

a reddish-brown substance that forms on the surface of iron, etc., caused by the action of air and water

Answer 2

Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. ... Rusting is the common term for corrosion of elemental iron and its alloys such as steel.

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