Structure of Atmosphere

Structure of Atmosphere
There are 5 layers of the Atmosphere as follows-
– Troposphere
The layer closest to the Earth, the Troposphere is a region of rising and falling air extending up to 13 km. It contains dust and water vapor. All weather phenomena like clouds, rainfall, snow, lightning, thunder etc., take place in this layer. It protects us from the heat of the Sun during the day and keeps us from freezing in night. The temperature of this layer decreases with altitude. The upper troposphere is called Tropopause.
– Stratosphere
This layer lies above the troposphere. It extends up to a height of 50 km. This layer is considered as the most stable layer of the atmosphere as it is free from clouds, winds, or any other weather phenomena. Therefore, it is suitable for flying jet planes. In the Stratosphere, the air temperatures are constant up to 20 km and rise with increasing height. The upper part of the Stratosphere is known as Stratopause. The lower part of the Stratosphere is known as ozonosphere. It contains ozone gas. Ozone absorbs the harmful ultraviolet rays of the Sun. The release of chlorofluorocarbons (CFCs) into the atmosphere by electric appliances like refrigerators is depleting this layer.
– Mesosphere
The layer above the Stratosphere is the Mesosphere. It extends between the stratopause and the mesopause, i.e. the boundary between mesosphere and thermosphere. The temperature decreases with altitude. Due to low temperature, water vapor present in this layer is frozen, forming noctilucent clouds. The mesosphere is also a protective layer wherein most meteorites burn out due to friction with the atmosphere.
– Thermosphere
The Thermosphere is the layer above the mesosphere and below the exosphere. It extends up to 400 km. The lower part of this layer is known as Ionosphere.The temperature of this layer increases with rising altitude. Between the Thermosphere and the Exosphere is the Thermopause.
– Exosphere
It extends up to 1600 km. It contains light gases like helium and hydrogen.

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