question: What causes metal surface to become orange?
choices.text: storms heat fires wind antigen pigment water light
choices.label: A B C D E F G H
fact2: Water cause parts to rust, and even a very small amount of rust can damage injectors.
combinedfact: water causes metal surface to become orange
formatted_question: What causes metal surface to become orange? (A) storms (B) heat (C) fires (D) wind (E) antigen (F) pigment (G) water (H) light