Pick out the reaction or phenomenon which best describes a chemical process.

A rusting metal pipe


A rusting pipe involves a chemical reaction in which the iron pipe oxidizes or turns into iron oxide. Iron oxide is formed when the oxygen in water combines with iron. In the evaporation of dry ice, the chemical composition does not change and the individual elements of the ice remain the same. Helium is an inert gas and doesn't combine with other elements, so there is no chemical change in this answer either. Soil erosion is not a chemical action; it is a result of the physical action of water and wind on the earth's surface.

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