The Statue of Liberty turned green due to a natural process called patination. The statue is made of copper, which initially had a reddish-brown color. However, over time, exposure to air and moisture caused the copper to form a layer of copper carbonate, also known as a patina. This patina has a greenish-blue color, which is why the statue appears green. The patina layer also protects the statue from further corrosion, making it more durable.
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