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You will learn about
Atmosphere and its importance
Composition of air
Properties of air
Importance of atmosphere
Many things make earth unique among the planets of the solar system. It is the only planet that has air and water. All living things need air and water to survive. That is why life is possible on Earth and not on other planets.
Air is present everywhere. We cannot see air, but we can feel it when it moves. Surrounding us is a thick layer of air called atmosphere. It is like a blanket around the earth. It extends to several hundred kilometers above the earth.
The atmosphere plays a very important role in sustaining life on earth in following ways:
Air is a colourless gas. Like other gases it has no definite shape or volume. Air has three properties.