MIRIAM MASLO / SCIENCE PHOTO LIBRARY MIRIAM MASLO / SCIENCE PHOTO LIBRARY
Ozone molecule. Molecular model of an ozone molecule (O3). Three oxygen atoms (red spheres) are joined together, forming an allotrope. Ozone is produced in the stratosphere by the action of high-energy ultraviolet (UV) radiation on oxygen. It forms a stable layer, known as the ozone layer, which screens the Earth from harmful UV radiation.
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