Multiple choice Holes in the ozone layer are caused by ____________. CO2 gas SO2 gas CFCs Ne gas Reveal answer Fill a bubble to check yourself C Correct answer Explanation The destruction of the ozone shield is linked to to CFCs. Each of these products releases CFCs into the atmosphere. Once free, the CFCs float up to the ozone layer and remain there for 75 to 100 years, destroying the ozone molecules.