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Hello everyone.
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Here in the first part, the skin of statue, it is formed by, formed of copper, which oxidizes when exposed to oxygen in the air, resulting in the formation of thin green crust of, thin green crust of patination.
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So, patination, it is a technique that protects metal, beneath the surface, beneath the surface.
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So, the statue took over 30 years to become green from its initial copper colour.
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This is the answer for the first part.
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In the second part, the following is the reaction to cu, cu plus h2o plus co2 plus co2 plus o2 and this gives cooh twice plus co3.
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So when copper is exposed to wet air for an extended length of time, a coating of a coating of basic copper carbonate, basic copper carbonate forms on the surface turning it green...