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Whenn a substance is left damp conditions or moisture full conditions then a red layer of rust get on it. this is corrosion.for eg corriosion of an iron pipes

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Corrosion is the deterioration of a metal due to chemical reactions between it and the surrounding environment. Corroding of metal makes it useless. For example- Rusting of Iron made materials,blackening or tarnishing of silver,etc.
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hope it helps
thnx fr ur suggestion :)
You're welcome
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