what produces carbon monoxide?
h2o burning coal hydrogen freezing heating homes chlorofluorocarbons cigarettes gasoline
A B C D E F G H
Gas furnaces heat homes for up to 20 years.
carbon monoxide is produced when heating homes
what produces carbon monoxide? (A) h2o (B) burning coal (C) hydrogen (D) freezing (E) heating homes (F) chlorofluorocarbons (G) cigarettes (H) gasoline