In this Book has contained the atmosphere is a mixture of different gases, particles and aerosols collectively known as air which envelops the Earth. The atmosphere provides various functions, not least the ability to sustain life. The atmosphere protects us by filtering out deadly cosmic rays, powerful ultraviolet (UV) radiation from the Sun, and even meteors on collision course with Earth and discussed in detail on Study of the Mesospheric Winds in Middle Atmosphere During Geminid Meteor Showers.