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प्रश्न
What are CFCs?
उत्तर
Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine. They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, as solvents, and as refrigerants. CFC = s react with sunlight in the earth’s stratosphere to break down the protective ozone layer, a layer of gas that shields the earth’s surface from damaging UV-B rays
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संबंधित प्रश्न
Explain the Term: Smog
Tick the causes of global warming
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Math the following.
| 1. | Nitrogen | Air pollution |
| 2. | Balloon | Smoke and fog |
| 3. | Smog | 78% |
| 4. | Lung cancer | Air |
The ‘thickness’ of Stratospheric Ozone layer is measured in/on:
SMOG is derived from:
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PAN
Why do not lichens occur in Delhi whereas they commonly grow in Manali or Darjeeling?
Name any two sources which causes air pollution due to Suspended Particulate Matter (SPM).
When air is contaminated by ______ substances which have a ______ effect on both the ______ and ______ it is referred to as______.
(air pollution, harmful, living, unwanted, non-living, pollutants)
Many ______ are responsible for causing ______ pollution. Petroleum ______ are a major source of ______ pollutants like ______ and ______.
(sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air)
