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22. The metal roof of a building has turned a light green colour. The metal roof is most likely
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22. The metal roof of a building has turned a light green colour. The metal roof is most likely

User Ford Guo
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The metal roof is most likely made of copper.

Copper turns green over an extended period of time when exposed to water. For example, The Statue of Liberty is made of copper and was once a bronze color. Now, it is green, similar to the roof
User Giuliano Galea
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