question: metal becomes orange on the surface as a result of
choices.text: magnetism friction treatment heating Car accidents oxidation air pollution condesation
choices.label: A B C D E F G H
fact2: Rust stains are the result of oxidation.
combinedfact: metal becomes orange on the surface as a  result of oxidation.
formatted_question: metal becomes orange on the surface as a result of (A) magnetism (B) friction (C) treatment (D) heating (E) Car accidents (F) oxidation (G) air pollution (H) condesation