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- Q79995 subject Q7210204.
- Q79995 subject Q8857539.
- Q79995 abstract "The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is only about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) above Earth, though the thickness varies seasonally and geographically.The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Measurements of the sun, showed that the radiation sent out from its surface, and which reaches the ground on Earth, is generally consistent with the spectrum of a black body with a temperature in the range of 5,500–6,000 K (5,227 to 5,727°C), except that there was no radiation below a wavelength of about 310 nm at the ultraviolet end of the spectrum. It was deduced that the missing radiation was being absorbed by something in the atmosphere. Eventually the spectrum of the missing radiation was matched to one known chemical, Ozone. Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer (the Dobsonmeter) that could be used to measure stratospheric ozone from the ground. Between 1928 and 1958, Dobson established a worldwide network of ozone monitoring stations, which continue to operate to this day. The "Dobson unit", a convenient measure of the amount of ozone overhead, is named in his honor.The ozone layer absorbs 97–99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which otherwise would potentially damage exposed life forms near the surface.The United Nations General Assembly has designated September 16 as the International Day for the Preservation of the Ozone Layer.Venus also has a thin ozone layer at an altitude of 100 kilometers from the planet's surface.".
- Q79995 thumbnail Ozone_cycle.svg?width=300.
- Q79995 wikiPageExternalLink oz_class.htm.
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- Q79995 wikiPageExternalLink www.copernicus-stratosphere.eu.
- Q79995 wikiPageExternalLink 4Aii_PublicInfo_Facts_OzoneLayer.asp.
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- Q79995 wikiPageWikiLink Q7210204.
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- Q79995 wikiPageWikiLink Q8857539.
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- Q79995 type Thing.
- Q79995 comment "The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is only about 0.3 parts per million.".
- Q79995 label "Ozone layer".
- Q79995 depiction Ozone_cycle.svg.