The atmosphere is the layer that surrounds the earth and resides thousands of kilometers above the earth’s surface. The atmosphere consists of gases, which are referred to as air, that are safeguarded by the earth’s gravity, surrounding the earth, and forming its planetary atmosphere.
It is made of three major components of the earth’s atmosphere: nitrogen, oxygen, and argon. The atmosphere preserves life on this planet by creating pressure allowing for liquid water to exist on the surface, absorbing ultraviolet solar radiation, warming up the surface through heat retention (also known as the greenhouse effect), and decreasing temperature extremes between day and night.
Air composition, temperature, and atmospheric pressure vary with altitude and air that the plants can obtain for photosynthesis, and the air the animals breathe is found only in the earth’s troposphere.