Why do old copper roofs in Cyprus turn green over time?
Answer and explanation
Correct answer: D. A layer of verdigris forms when copper reacts with air and moisture
- Step 1: Chemical changes affect the surface of metal. Step 2. The green patina is copper carbonate and other compounds. Answer: A layer of verdigris forms when copper reacts with air and moisture. Why not the others: The colour is not from fading paint or algae; copper does not melt at those temperatures.
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