A layer of the atmosphere or a theoretical zone where chemical reactions are particularly active or dominant.
From chemo- (chemistry) + sphere (from Greek sphaira, 'ball' or 'globe'). This term describes an atmospheric region defined by its chemical characteristics rather than its altitude.
The chemosphere concept helps scientists understand the mesosphere—a zone about 50-80 km up where extremely active chemical reactions break apart oxygen and create protective ozone.
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