2. The atmosphere
2.1 Structure
The atmosphere can be considered as a series of layers concentric with the earth, delimiting several zones.
The two main zones are :
the homosphere, located from the ground to an altitude of about 80 to 90 km ;
the heterosphere, beyond.
Within the homosphere, three main atmospheric layers are defined, differentiated by their temperature gradient with altitude (figure 3 ):
the troposphere ;
the stratosphere;
...
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The atmosphere
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