Atmosphere is the blanket of air that surrounds the earth. It is made up of gases water vapours and impurities such as dust and smoke. It contains 21% oxygen, 78% nitrogen and 0.9% argon. In addition it contains water vapour, carbon dioxide and traces of other gases. The earth atmosphere makes life possible on earth. The atmosphere helps to keep the earth warmth from escaping into space at night. If the atmosphere was not present the temperature during the day would be more than hundred 100 degree Celsius and at night it would be freezing as – 1 73 degrees celsius. The higher we go above sea level the thinner the air in the atmosphere become. At very high mountains the air is too thin to breathe comfortably. The atmosphere consists of five layers that are held in place by the earth gravitational force.

The Troposphere is the lowest layer where we live and which contain 90% of the air in the atmosphere. Air is the warmest near ground level. The higher we go the colder it gets almost all weather phenomenon occurs in this layer.

The stratosphere is a second layer of the earth atmosphere it contains a layer of ozone that protect us from the harmful effect of the sun’s ultraviolet rays.

the mesosphere is a third layer. Most meteors burn up in this layer as they enter the earth atmosphere.

In the fourth layer the thermosphere temperature range between 500 Celsius to 2000 degree Celsius.

The exosphere is the fifth layer of 5he atmosphere and the outermost layer of the atmosphere. Their are several satellites in the Orbit of the earth with this layer. the atmosphere emerges with space there.