Terrestrial atmosphere
= Terrestrial atmosphere
The terrestrial atmosphere has regions with opposite signs of the <atmospheric lapse rate>: the <troposphere> usually cools upward, the <stratosphere> warms upward through ultraviolet heating, the <mesosphere> cools, and the <thermosphere> warms. A monotone <atmospheric pressure-temperature profile> can approximate one such interval, but cannot describe all their transitions with one fixed branch.