57. Ozone layer is present in A.Troposphere B.Ionosphere C.Stratosphere D.Exosphere
Answer: Option C Solution: Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.