ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Model of a molecule of ozone, an allotrope of oxygen composed of three oxygen atoms (red spheres). Ozone is produced in the stratosphere by the action of high-energy ultraviolet radiation on oxygen. It forms a stable layer, known as the ozone layer, which screens the Earth from harmful ultraviolet radiation.
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