What will cause metal to turn orange?
Exposure to nitrogen higher ultraviolet  radiation thermal expansion Exposure to hydrochloric acid antigens that cause allergy a surface not sterilized Exposure to helium and carbon Exposure to oxygen and water
A B C D E F G H
Iron rusts in the presence of oxygen and water.
oxygen and water will cause metal to turn orange
What will cause metal to turn orange? (A) Exposure to nitrogen (B) higher ultraviolet  radiation (C) thermal expansion (D) Exposure to hydrochloric acid (E) antigens that cause allergy (F) a surface not sterilized (G) Exposure to helium and carbon (H) Exposure to oxygen and water