An atmospheric layer of the earth which extends from about six miles up to about 30 miles up. It contains a high concentration of ozone (Surprise, surprise!) and absorbs much of the ultraviolet radiation directed at the earth; it also prevents some of the planet's heat loss. It is also known as the ozonosphere.

There is currently a large hole in the ozone layer over Antarctica. It is generally acknowledged to have been caused by air pollutants such as fluorocarbons. It is also generally believed to be a factor in global warming.

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