Question

define atmosphere......

Answer 1

Explanation:

An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body ... at an altitude of 100 km, is commonly used to define the boundary between Earth's atmosphere and outer space.

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Answer 2

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An atmosphere is the layers of gases surrounding the earth. It consists of 5 layers :

(i) Troposphere

(ii) Stratosphere

(iii) Mesosphere

(iv) Ionosphere

(v) Exosphere