Ozone is present as a chief constituent in which region of the atmosphere?
A
Troposphere
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B
Stratosphere
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C
Mesosphere
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D
Thermosphere
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Solution
The correct option is A Stratosphere The stratosphere lies between 18 - 50 km above sea-level. In this region, at about 20 - 40 km, there is a part of relatively high ozone concentration, called the ozone layer.