define the layers of atmosphere
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Answer:
atmosphere is the layer of earth that cover and protect it from UV radiations. it helps in absorption of heat energy (hydrogen) .
Layers Of Atmosphere
Atmosphere of earth can be considered as the mixture of gases which surrounds the earth. Atmosphere plays an important role in making life possible on earth by protecting our earth from harmful UV radiations of sun.
Several gases such as nitrogen, oxygen and carbon dioxide etc are present in our atmosphere. Each gas has its own composition. About 78% Nitrogen, 21% oxygen and in remaining 1% all other gases are present.
From low to high classification the layers of atmosphere are labeled as: Troposphere, Stratosphere, Mesosphere and Thermosphere.
1. Troposphere -
It is the first layer of the Earth's atmosphere and it extends up to 10–15km above the Earth's surface. The temperature goes on decreasing when you go on moving up in the troposphere. Troposphere contains more than 75% of the total mass of the atmosphere. Troposphere is wider at the equator than at the poles.
2. Stratosphere -
It is the second layer of the earth atmosphere and is extends up to 15–45km from the earth's surface. Ozone layer is found in this layer. Stratosphere is cooler at the bottom but when the body goes up in the direction of stratosphere temperature rises continuously.
3. Mesosphere -
This layer is just above the earth's surface and is extending up to 50–80km above the earth's surface. It is a cold layer because when there is increase in altitude than temperature goes on decreasing. This layer is mainly accessed by sounding rockets or rocket powered aircrafts.
4. Thermosphere -
It is the layer just above the mesosphere and is extending from 80km above the earth's surface to the outer space. It is a very hot layer, here the temperature may extend up to thousands of degrees.