The outermost layer of the earth's atmosphere is

Stratosphere

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Mesosphere

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Troposphere

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Ionosphere

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Solution

The correct option is D Ionosphere
Ionosphere is the outermost layer of earth's atmosphere. This layer contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above mesosphere and extends from 80 to 1,000 km above the earth's surface.

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