State the components of the atmosphere.

The Earth's atmosphere consists of a mixture of various gases surrounding the Earth. It is an envelope of gases encompassing the Earth, held by gravity. Two main gases Nitrogen (78%) and Oxygen (21%), make up about 99% of the clean dry air. The remaining gases are almost inert and constitute about 1% of atmosphere. Out of this 1%, Argon is 0.93%. The atmosphere also contains water vapour and dust particles.