Each layer is defined by a general trend in temperature with increasing altitude:
* Troposphere: Temperature decreases with increasing altitude.
* Stratosphere: Temperature increases with increasing altitude due to the absorption of ultraviolet radiation by the ozone layer.
* Mesosphere: Temperature decreases with increasing altitude.
* Thermosphere: Temperature increases with increasing altitude due to the absorption of solar radiation.
* Exosphere: Temperature continues to increase with altitude, but the atmosphere is extremely thin here.
So, while other properties like pressure and density also change with altitude, it's the temperature profile that serves as the primary basis for defining the different atmospheric layers.
