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  1. Density of the earth’s atmosphere is highest in the
    1. Troposphere
    2. Stratosphere
    3. Mesosphere
    4. Ionosphere
Correct Option: A

Over 99% of the mass of the earth's atmosphere is contained in two layers: the troposphere and the stratosphere. Most of the earth's atmosphere (80 to 90%) is found in the troposphere, the atmospheric layer where we live. This layer, where the earth's weather occurs, is within about 12 km of the earth's surface.



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