Question

What is atmosphere

Answer 1

Heya!!!

Atmosphere
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Atmosphere is a layer of gases which surround heavenly bodies like planets and protect organisms from harmful radiations as a blanket.

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Answer 2

An atmosphere is a blanket of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low (the gases do not escape).

The atmosphere of Earth is mostly composed of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%) with carbon dioxide and other gases in trace amounts.

Oxygen is used by most organisms for respiration, nitrogen is fixed by bacteria and lightning to produce ammonia used in the construction of nucleotides and amino acids and carbon dioxide is used by plants, algae and cyanobacteria for photosynthesis. The atmosphere helps in protection from living organisms from genetic damage by solar ultraviolet radiation, solar wind and cosmic rays (for example-ozone or O3 protects us from U.V rays).