ozone

  Ozone layer From Wikipedia, the free encyclopedia Jump to navigation Jump to search Ozone-oxygen cycle  in the ozone layer. 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  (O 3 ) in relation to other parts of the atmosphere, although still small in relation 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 about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers (9 to 22 mi) above Earth, although its thickness varies seasonally and geographically. [1] The ozone layer was discovered in 1913 by the French physicists  Charles Fabry  and  Henri Buisson . Measurement...