Which of the following chemical pollutants can cause groundwater contamination?
Petroleum
Chlorofluorocarbons (CFCs)
Polychlorinated biphenyls (PCBs)
All of the above
Petroleum, CFCs, and PCBs are all examples of chemical pollutants that can contaminate groundwater. Petroleum can leak from underground storage tanks, while CFCs and PCBs can leach from landfills and other waste disposal sites.