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    Question

    Which of the following constitutes the lowermost layer of

    the Earth's atmosphere?
    A Mesosphere Correct Answer Incorrect Answer
    B Troposphere Correct Answer Incorrect Answer
    C Thermosphere Correct Answer Incorrect Answer
    D Exosphere Correct Answer Incorrect Answer

    Solution

    The troposphere represents the lowest layer of the atmosphere and contains the densest air. It comprises approximately three-quarters of the entire atmospheric mass. The composition of air in this layer is 78% nitrogen and 21% oxygen, with the remaining 1% consisting of argon, water vapor, and carbon dioxide. This layer is where most weather phenomena occur.

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