The Atmosphere is a transparent envelope of gases and suspended particles that surround the Earth. Without Chemical processes involving several of the atmospheric gases, life could not exist. Even the physical processes that operate in the atmosphere are of vital importance because they are responsible for the Earth's varied climates. The Atmosphere is composed almost entirely of Oxygen and Nitrogen.The Atmosphere is the source of every living thing in the world. It plays a very important role in serving the world's needs.