The ozone layer is a layer in Earth's atmosphere which contains relatively high concentrations of ozone (O3). The ozone layer absorbs 93-99% of the sun's high frequency ultraviolet light, which is potentially damaging to life on earth. Over 91% of the ozone in Earth's atmosphere is present in the ozone layer. The ozone layer is mainly located in the lower portion of the stratosphere from approximately 10 km to 50 km above Earth. The thickness of the ozone layer varies seasonally and geographically. The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson.
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