CFCs remain in the troposphere because they are ____________________ in water and chemically unreactive.

CFCs

Chlorofluorocarbons, a class of chemical compounds used in refrigeration, air conditioning, and aerosol propellants, known to contribute to ozone depletion.

Troposphere

The lowest layer of Earth's atmosphere where most of the planet's weather occurs, extending up to about 10 km above the surface.

Chemically Unreactive

Describes substances that do not easily undergo chemical reactions or change their chemical structure in the presence of other substances.