In the troposphere, temperature decreases with height due to decreasing air pressure and density. In the stratosphere, temperature increases with height because of the absorption of ultraviolet radiation by the ozone layer. The mesosphere sees a temperature decrease with height again, while in the thermosphere, temperatures rise sharply due to the absorption of high-energy solar radiation. The exosphere, the outermost layer, has very high temperatures but low heat due to the sparse number of particles.
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