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प्रश्न
What is meant by ozone depletion?
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उत्तर
- Ozone is present in the upper layer of the atmosphere called the stratosphere. It protects the earth from harmful ultraviolet rays of the sun.
- Some air pollutants, like chlorofluorocarbon (CFC), react with ozone present in the atmosphere. These pollutants reduce the density of the air.
- The ultra-violet rays from the sun reach directly on the earth, which affects human health, causing skin diseases and cancer and also increase the earth’s temperature.
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संबंधित प्रश्न
What is greenhouse effect?
Why can’t we see air?
Name two air pollutants which cause global warming.
Fill in the blank
Polluted air is harmful to ____.
State what do you understand by the term ‘air’. Explain its importance to mankind.
Give a brief account of the discovery of air and the scientists involved.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
Name the important scientists and their studies which led to the discovery of the components of air.
Draw a neat labelled diagram for the following experiment.
To prepare oxygen in the laboratory from hydrogen peroxide and a catalyst.
About 78% of the volume of air is ______.
