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    Composition and Structure of Atmosphere
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    What is the tropopause ?
    The zone separating the tropsophere from stratosphere is known as the tropopause.
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    How is the atmosphere held to the earth?

    Atmosphere is a gaseous envelope extending thousands of kilometres above the surface of the earth. It is held to it by the force of gravity.
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     Name the topmost layer of the atmosphere.
    exosphere
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    Which layer of atmosphere reflects radio waves ?

    ionosphere

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    The luminous phenomena seen in the night sky in high altitudes in the Southern Hemisphere.
    Aurora borealis.
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