Change in colour of the Statue of Liberty is an evidence of chemical reactions occurring on its surface.
Statue of liberty is fully covered with plates of copper. Because of this, originally it was of copper colour. However over a period, because of action of moisture and oxygen in the atmosphere the copper on the surface of copper plates covering the statue, chemically combined with oxygen and got converted into copper oxide. As copper oxide is green coloured, the surface of statue, covered with it because of the chemical reaction of the copper, acquired greenish hue over a period.
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