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Sulfur compounds such as hydrogen sulfide and sulfur dioxide (SO Earth's atmosphere Lower 4 layers of the atmosphere in 3 dimensions as seen diagonally from above the exobase.
Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space.
Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.
In general, air pressure and density decrease with altitude in the atmosphere.
The atmosphere has a mass of about 5.15 three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.
The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space.