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Discussion :: Atmosphere

  1. Consider the following statements:
    1. Nearly 99 percent of the total mass of the atmosphere lies within 30 km of the Earth's surface.
    2. The proportion of ozone in the atmosphere increases to a maximum at about 60 km from Earth's surface.
    Which of the statements given above is/are correct?

    2. A.

     1 only
    B.

     2 only
    C.

     Both 1 and 2
    D.

     Neither 1 nor 2

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    Answer : Option A

    Explanation :

    Nearly 99 percent of the total mass of the atmosphere lies within 30 km of the Earth's surface. About 99% of the total atmospheric mass is concentrated in the first 20 miles (32 km) above Earth's surface.

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