Which of the following statements is correct?
(i) Ozone hole is a hole formed in stratosphere from which ozone oozes out.
(ii) Ozone hole is a hole formed in the troposphere from which ozone oozes out.
(iii) Ozone hole is thinning of ozone layer of stratosphere at some places.
(iv) Ozone hole means vanishing of ozone layer around the earth completely

Answer: (iii)
Solution: (i) This statement is incorrect.
Ozone holes are not formed from which ozone oozes out. In fact, ozone holes are areas in the stratosphere where the concentration of ozone is significantly reduced due to the presence of certain chemicals, such as chlorofluorocarbons (CFCs).
(ii) This statement is also incorrect. Ozone is not present in significant amounts in the troposphere, which is the lowest layer of the Earth’s atmosphere. The ozone layer is located in the stratosphere, which is the layer above the troposphere.
(iii) This statement is correct. Ozone hole refers to the thinning of the ozone layer in the stratosphere at certain locations. This thinning is caused by the release of chemicals such as CFCs, which react with ozone and break it down into other compounds.
(iv) This statement is incorrect. Ozone hole does not mean the vanishing of the ozone layer around the Earth completely. While the thinning of the ozone layer can have serious consequences, it is not expected to completely disappear. However, it is important to take steps to reduce the release of ozone-depleting chemicals to prevent further damage to the ozone layer.

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