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When and how was the ozone layer formed?

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Stratosphere ozone is good ozone bcz it protect us from Sun's biologically harmful ultraviolet rays and also formed by reaction of natural components. Tropospheric ozone is bad ozone, formed by the reaction of man made pollutants, harmful to plants and animals. read more

Ozone in the ozone layer is formed when UV-C from the Sun dissociates an oxygen molecule, and some of those now-loose oxygen molecules connect with an oxygen molecule to form ozone. Ozone in a rain storm is made by lightning dissociating oxygen molecules, and the rest occurs as above. read more

Thankfully, the ozone layer protects us from most of the sun's harmful UV rays. Ninety percent of the atmospheric ozone is in the earth's stratosphere-- the altitude starting at six to 11 miles (9.6 to 17.7 kilometers) above the earth and extending to about 30 miles (48.3 kilometers) above the earth [source: Fahey]. read more

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How the Ozone Layer Works
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