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    Question

    Which layer of Earth's atmosphere is closest to the

    surface and contains most of the planet's mass of air?
    A Stratosphere Correct Answer Incorrect Answer
    B Troposphere Correct Answer Incorrect Answer
    C Mesosphere Correct Answer Incorrect Answer
    D Thermosphere Correct Answer Incorrect Answer

    Solution

    The troposphere is the lowest layer of Earth's atmosphere and extends approximately 7 to 20 kilometers above the Earth's surface. It contains about 75% of the atmosphere's mass and almost all of its water vapor and aerosols. This is the layer where most weather phenomena occur.

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