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GS Geography Physical Geography of World
Q.

A level of atmosphere which is composed partly of electrons and positive ions is called:
Explanation:

ANS. (B) 
Ionosphere is composed partly of electrons and positive ions. It is a region of Earth’s upper atmosphere, from about 60 km to 1,000 km altitude, that is ionized by solar radiation. This layer is also called thermosphere as its temperature rises with height.

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