CBSE Class 10 Answered
what is ozone layer depletion?what are the causes and what are the steps taken to prevent ozone layer depletion?also mention the harmful effects of ozone layer depletion.
Asked by niharika | 20 Jan, 2016, 06:19: PM
Expert Answer
Hi Nikki,
Ozone layer depletion:
- Depletion in the ozone layer of the atmosphere is called ozone depletion.
- The ozone layer or the ozone shield called the ozonosphere is present in the stratosphere at an altitude of 23–25 km over the equator and at a slightly lower altitude of 11–16 km over the poles.
- The ozone layer functions as a shield against strong UV radiations and protects the Earth from these harmful radiations.
Causes of ozone depletion:
- Methyl bromide
- Nitrogen oxides released from freezers, air conditioners, aerosol products and industrial solvents
- Compounds such as CFCs break down into chlorine atoms in the atmosphere. These chlorine atoms break down O3 into oxygen (O2) and nascent oxygen (O).
Effects of Ozone Depletion
- Incidence of skin cancer, cataract and poor immune response in humans.
- Affects crop yield and productivity in plants.
- Marine and terrestrial food chains get disturbed.
- UV-B damages DNA and can result in mutations.
Measures to prevent ozone depletion:
- Limit private vehicle driving
- Avoid using pesticides
- Banning the use of dangerous nitrous oxide
Answered by | 20 Jan, 2016, 06:30: PM
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