What has occurred? an endothermic reaction
an energy formation
a chemical reaction
a precipitate formation

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.

a chemical reaction

Explanation:

What has happened to the statue of liberty is that a chemical reaction has occurred to the materials making up this edifice.

The statue is made up of copper. On reacting with oxygen, it undergoes an oxidation.

This makes the copper to rust and decolorize.

It implies that copper has reacted with oxygen in air and possibly from water.

This gives a new product.

We know this because for most chemical changes, they give new products and are not easily reversible.

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