A gas threatening Earth's ozone layer is
A) sulfur dioxides.
B) chlorofluorocarbons.
C) the greenhouse effect.
D) photochemical smog.
E) nitrous oxide.

Question

Quizplus · Accepted Answer

Chlorofluorocarbons (CFCs) are synthetic compounds that were commonly used in aerosol sprays, refrigerants, and solvents. When released into the atmosphere, they rise up to the stratosphere where they undergo a chemical reaction that breaks down ozone molecules, which can result in the formation of holes in the ozone layer. The use of CFCs has been greatly reduced since the signing of the Montreal Protocol in 1987.

A Gas Threatening Earth's Ozone Layer Is