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It is changing by weathering because when it rains a lot and the Statue of Liberty is made from a little bit iron, the iron gets wet and rusts the Statue of Liberty.
Rust
The Statue of Liberty was a gift to the United States from France. It is hollow, with an iron framework and copper plating.
The exterior of the Statue of Liberty is made of copper which is 3/32 inches thick. The interior of the Statue is made from wrought iron and steel.
The statue is built with an iron frame and copper sheeting for the skin.
Gustave Eiffel
The torch is constructed of copper and wrought iron.
Iron rusts when it is exposed to oxygen and moisture, causing a chemical reaction that forms iron oxide. The green color on the Statue of Liberty is due to oxidation of the copper in the statue's protective coating over time, forming a blue-green patina called verdigris.
Originally an iron structural skeleton, with a sheet-copper skin.
The Statue of Liberty weighs approximately 225 tons (or about 450,000 pounds). This includes the weight of its copper exterior and the iron framework inside. The statue stands on Liberty Island in New York Harbor and was a gift from France to the United States, dedicated in 1886.
The Statue of Liberty is made of copper supported by an iron skeleton. "179,200 pounds (81,300 kilograms) of copper was used in Statue. 250,000 pounds (113,400 kilograms) of iron. Total weight of the Statue is 450,000 pounds (225 tons). The thickness of Copper sheeting is 3/32 inch (2.37mm), about the thickness of a penny. "