The atmosphere is the air surrounding the Earth, consisting of a series
of shells or layers with different characteristics. The atmosphere,
composed mainly of nitrogen and oxygen with traces of carbon dioxide,
water vapor, and other gases, acts as a buffer between the Earth and the
sun. The layers, troposphere, stratosphere, mesosphere, thermosphere,
and the exosphere, vary around the globe and in response to seasonal
Layers of the Earth's atmosphere.
Credits - NASA