Chemistry — Stratospheric Ozone
The Chapman cycle that maintains the ozone layer.
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\text{O}_2 + h\nu \rightarrow 2\,\text{O}
\text{O} + \text{O}_2 \rightarrow \text{O}_3
\text{O}_3 + h\nu \rightarrow \text{O}_2 + \text{O}
\text{absorbs harmful UV}