What is the atmosphere and useful for us?
The thick blanket of air
surrounding the earth is known as atmosphere. It is a layer of gases
surrounding the earth. This layer protect life on the earth by absorbing
ultraviolet solar radiation and reducing temperature extremes between day and night.
The atmosphere is made of different layers. These layers are- troposphere,
stratosphere, mesosphere, thermosphere and exosphere. The troposphere is the lowest
and the densest layer of the atmosphere. All weather changes take place in this
layer. The stratosphere lies above the troposphere. The ozone layer that
absorbs the UV solar energy is located in this layer. The troposphere extends
from 8 km to 14.5 km above sea level. Though it is the thinnest layer, it
contains four-fifths of all air. The meteors entering the earth’s atmosphere
burn up in the mesosphere. The thermosphere is the layer that is first heated
by the sun . the ionosphere makes radio communication possible due to the presence
of charged particles. The artificial satellites orbit the earth in the
exosphere.
