SCIENCE
ENVIRONMENTAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Chlorofluorocarbons used in agriculture.
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Chlorofluorocarbons used in nuclear energy.
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Chlorofluorocarbons used in coolants, cleaning solvents, and propellants in spray cans.
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None of the above
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Detailed explanation-1: -Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons-gases formerly found in aerosol spray cans and refrigerants-are released into the atmosphere (see details below).
Detailed explanation-2: -The ozone hole has developed because people have polluted the atmosphere with chemicals containing chlorine and bromine. The primary chemicals involved are chlorofluorocarbons (CFCs for short), halons, and carbon tetrachloride.
Detailed explanation-3: -In 1985, BAS scientists discovered that since the mid-1970s ozone values over Halley and Faraday Research Stations had been steadily dropping when the Sun reappeared each spring. Something in the stratosphere (about 20km above Earth) was destroying the Antarctic ozone layer.
Detailed explanation-4: -Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules. See Ozone Depleting Substance.) as aerosol.