RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Ozone molecule, computer artwork. Molecular model of an ozone molecule (O3). Three oxygen atoms (red) are joined together, forming an allotrope. The molecule is surrounded by van der Waals radii (black). 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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