What happens when iron is exposed to water and oxygen?

• Correct Answer: rusting
• combustion
• smoking
• shrinking

Explanation: Corrosion involves the formation of an oxidized form of a metal by an electrochemical process. A common example is the rusting of iron when exposed to water and oxygen. The tarnishing of silver and the red or green deposits formed on copper are other examples. Corrosion in all its forms costs the U. S. millions of dollars each year in expenses for metal replacement.

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