ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Corrosion. View of a heavily corroded metal gate. Large amounts of orange rust can be seen beneath the peeling paint. Rust is a compound formed by the attack of air and water on iron. Surfaces prone to attack are usually painted to keep air and water out, but if the paint starts to peel, as here, the metal can rapidly be destroyed.
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