Why does the temperature increase with height in the stratosphere, thermosphere and exosphere?

Dear student,

Here is the answer:

The temperature increases with height in the stratosphere, thermosphere and exosphere because:

Stratosphere: This layer extends to a height of 50km from the surface. This layer is above the troposphere. The temperature increases with increase in height because the ozone layer absorbs most of the sun's ultra violet radiation. The  main function of the ozone layer is to absorbs the ultraviolet radiation to prevent these rays from hitting the Earth's surface.

Thermosphere: This layer of atmosphere, extends to a height of around 450km. It is also known as ionosphere. The temperature increases with increase in height is due to the fact that this layer absorbs huge amount of solar radiation. 

Exosphere: This layer extends to a height of around 1600 km and beyond that, it merges with the interplanetary space.This layers is almost a vacuum. The temperature increases with increase in height because this layer is closest to the sun. The air in exosphere is thin and is made up of helium and hydrogen. The particles (molecules or atoms) in the exosphere are moving very quickly, so the temperature there is quite hot.  

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