All of the following gases come in part from natural sources EXCEPT
A)carbon dioxide.
B)chlorofluorocarbons (CFCs).
C)sulfur dioxide.
D)hydrocarbons.

Question

Quizplus · Accepted Answer

Chlorofluorocarbons (CFCs) are synthetic gases that are not produced by natural means. The other gases listed have natural sources, such as volcanic activity for sulfur dioxide and the burning of fossil fuels for carbon dioxide and hydrocarbons.

All of the Following Gases Come in Part from Natural