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The base of the thermosphere is considered the boundary between the

homosphere and the heterosphere because, above this level:






the atmosphere is electrified.


collisions between atoms are infrequent and the atmosphere can no longer keep itself stirred.


ozone is the dominant gas in the atmosphere.


the density of the atmosphere is so large that molecules can barely move.


lighter gases settle to the bottom and heavier gases rise to the top.

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