Green Glossary
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Ozone layer
The ozone layer is a layer in Earth's atmosphere that contains relatively high concentrations of ozone, a reactive gas that is harmful at ground level but makes up the ozone layer. This layer absorbs 93-99% of the sun's high frequency ultraviolet light, which is harmful to life on earth. It is located in the lower portion of the stratosphere, approximately 10 to 50 km above the Earth's surface, though the thickness varies seasonally and geographically.
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