Atmosphere of Earth

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth.By the volume, dry air contains nitrogen, oxygen, argon,  carbon dioxide, and small amounts of other gases.It  also contains a variable amount of water vapor.The atmosphere has a mass of about 5.15×1018 kg. The study of Earth's atmosphere and its processes is called atmospheric science [aerology].Water vapor accounts for roughly 0.25% of the atmosphere by mass.

The five main layers are:
Exosphere,Thermosphere,Mesosphere,Stratosphere,Troposphere.


Source - wikipedia