Name the topmost layer of the atmosphere.

exosphere
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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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What is the tropopause ?

The zone separating the tropsophere from stratosphere is known as the tropopause.
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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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