The _______ is the coldest layer of the atmosphere.a.troposphereb.stratospherec.mesosphered.thermosphere
When is ozone considered a pollutant?a.in the stratosphereb.in the mesospherec.in the troposphered.in the thermosphere
How is good (stratospheric) ozone formed?a.combining an oxygen molecule (O2) an atom of chlorine (Cl)b.combining a single oxygen atom (O) with an oxygen molecule (O2)c.combining two single oxygen atoms d.breaking apart an oxygen molecule
Humans are not the only animals that pollute the air.
Where are chlorofluorocarbons found?a.coolantsb.the atmospherec.solventsd.all of the above
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