Question

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

Explanation:

Oxidation is a chemical - change process where a substance reacts with oxygen to form a new substance. This is a type of chemical reaction. An endothermic reaction is about heat absorption, energy formation is a very general term not specific to this context, and precipitate formation involves the formation of a solid from a solution which is not relevant here.

Answer:

C. a chemical reaction