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Rusty chain

Heavy rust on the links of a chain near the Golden Gate Bridge in San Francisco. It was continuously exposed to moisture and salt-laden spray, causing surface breakdown, cracking, and flaking of the metal. In colloquial usage, "rust" refers to red iron(III) oxide and is formed by the reaction of iron and oxygen in the presence of water.

Photo: WikipedianMarlith/Iamthedeus
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