Atmosphere's of the earth

Troposphere is the first layer extends to 30,000 feet from the ground. This is layer is where most clouds are located.
Stratosphere is the second layer which has no clouds and it also has the ozone layer which extends from the tropopause for 12 km to 170 km. Since the ozone  absorbs UV radiation its temperature is high.
Mesosphere is the next  layer extending from 50 km to 80 km this is where meteors burn up and the temperature decreases with higher height. 

Thermosphere is the next layer with the higher temperature that can be up to 1500 C this is caused by high density molecules rubbing against each other. This layer extends from 80 km to 350 km till the exobase.

Exosphere extends from 350 km to 800 km it usually contains hydrogen and helium in its layer as they are the lightest gas found in the periodic table so they are found exosphere. 

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