The earth’s lower atmosphere, or homosphere, is 99omposed of nitrogen and oxygen gases.
The homosphere is the lower of the two and is where turbulent mixing dominates molecular diffusion of gases. Below about 60 miles (about 100 km), the atmospheric composition tends to be altitude-independent.
The main difference between homosphere and heterosphere is that the homosphere is the lower part of the atmosphere up to about 100 km while the heterosphere is the upper part of the atmosphere. The homosphere and heterosphere are her two layers of the atmosphere.
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