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5Â years, 6Â months ago
5Â years, 6Â months ago
The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains a high concentration of ozone (O3) in relation to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers above Earth, although its thickness varies seasonally and geographically. The ozone layer absorbs 97 to 99 percent of the Sun's medium-frequency Ultraviolet light, which otherwise would potentially damage exposed life forms near the surface.
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