_______________ is the envelope of air which surrounds the earth.

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Solution

Atmosphere:
It is the gaseous mixture that envelops the earth. It is also referred to as the atmosphere and remains in place because of the gravity of the Earth.
It is composed of various gases primarily oxygen (21%), nitrogen (79%), carbon dioxide (0.04%), noble gases (mainly argon up to 0.9%), water vapour (variable), and trace elements (variable) etc.
The various components in the air are crucial for the sustenance and survival of .plants and animals.

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