What can release mercury into the atmosphere? 
smoking tobacco hydrogen and oxygen flow of electrons cigarettes chemical reaction an engine generating heat one celled organisms
A B C D E F G H
Coal releases mercury when it is burned.
Some methods of generating heat release mercury.
What can release mercury into the atmosphere?  (A) smoking tobacco (B) hydrogen and oxygen (C) flow of electrons (D) cigarettes (E) chemical reaction (F) an engine (G) generating heat (H) one celled organisms