Among some of the functions of the atmosphere we have:
1) The atmosphere acts as a protective shield or as a shield against the possible fall of meteorites coming from outer space on the earth.
2) The atmosphere protects the planet earth against the action of solar radiation. Without the atmosphere, human beings are exposed to the action of ultraviolet rays.
3) The atmosphere provides oxygen. This is vital for the organism in order to be able to complete the basic functions of life.
4) The atmosphere protects the planet from drastic variations in temperature and climate during the day and night.