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Q. Consider the following statements:

Which of the above statements is/are correct?



A

1 and 2 only
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B

2 only
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C

2 and 3 only
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D

 1 and 3 only
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Solution

The correct option is B
2 only

Explanation:

Statement 1 is incorrect: The zone separating the troposphere from the stratosphere is known as tropopause.

Statement 2 is correct: Density is highest near the surface of the earth and decreases with increasing altitude. This is due to the effect of gravity. 

Statement 3 is incorrect: The stratosphere contains the ozone layer that shields the earth from harmful UV radiations.

Extra Information: The column of the atmosphere is divided into five different layers depending upon the temperature conditions. They are : troposphere, stratosphere, mesosphere, thermosphere and exosphere. Troposphere is the lowermost layer. The temperature in the mesosphere again starts decreasing. Radio waves transmitted from earth are reflected back to the earth by this layer.


Geography

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