ATMOSPHERE...........in brief................

Composition of the Atmosphere
======================
(i) Nitrogen – 78%
(ii) Oxygen – 21%
(iii) Argon -0.93%
(iv) Carbondioxide – 0.03%
(v)Neon – 0.0018%
(vi) Helium – 0.0005% 
(vii) Ozone – 0.0006%
(viii) Hydrogen – 0.00005%
.

Layers of the Atmosphere
There are five distinct layers of the atmosphere –
(a) Troposphere 
(b) Stratosphere 
(c) Mesosphere 
(d) Thermosphere
(e) Exosphere

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