Which of the following statements is are correct with regard to Ozone Depletion 1 Ozo...........

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Which of the following statements is/are correct with regard to Ozone Depletion:

1. Ozone hole is measured in terms of ozone concentrations, which is expressed in Dobson units.

2. Ozone layer can absorb all kinds of UV radiations

3. Ozone holes over poles have large seasonal variations

Which of the statements mentioned are correct?

1 and 2 only

1 and 3 only

2 and 3 only

All of the above

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Explanation:

2. Generally, the shorter the wavelength, the more biologically damaging UV radiation can be if it reaches the Earth in sufficient quantity. UV-A is the least damaging (longest wavelength) form of UV radiation and reaches the Earth in greatest quantity. Most UV-A rays pass right through the ozone layer in the stratosphere. UV-B radiation can be very harmful. Fortunately, most of the sun's UV-B radiation is absorbed by ozone in the stratosphere. UV-C radiation is potentially the most damaging because it is very energetic. Fortunately, all UV-C is absorbed by oxygen and ozone in the stratosphere and never reaches the Earth's surface.