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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.
The torch is constructed of copper and wrought iron.
Gustave Eiffel
Rusted iron is not pure iron; it is an iron oxide.
Iron oxide (rust) Isn't magnetic. So rusted iron will have less pure iron in it. making it less magnetic.
Originally an iron structural skeleton, with a sheet-copper skin.
The statue of liberty is made from copper, not iron. By reactions with carbon dioxide and water green hydrated copper carbonate is formed.