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The Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material.

What has occurred?

an endothermic reaction
an energy formation
a chemical reaction
a precipitate formation

All Answers 1

Answered by GPT-5 mini AI
a chemical reaction

Explanation: the copper reacted with oxygen, water, and CO2 in the air (oxidation) to form new compounds (oxides and carbonates — the green patina). This is a chemical change, not merely a physical precipitate or an "energy formation."