Respuesta :

2 gases make up the earths atmosphere, nitrogen which comprises 78% of the atmosphere, and oxygen which accounts for 21%. 

The atmosphere is divided into 4 layers, the troposphere, stratosphere, mesosphere, and the thermosphere. 
Nausicca202
It is mostly nitrogen (78%) and oxygen (21%) and a few other gasses like 0.93% argon, 0.038% carbon dioxide and probably some others

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