<P> The ozone layer or ozone shield is a region of Earth 's stratosphere that absorbs most of the Sun 's ultraviolet ( UV ) radiation . It contains high concentrations of ozone ( O ) 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 20 to 30 kilometres ( 12 to 19 mi ) above Earth , although its thickness varies seasonally and geographically . </P>
<P> The ozone layer or ozone shield is a region of Earth 's stratosphere that absorbs most of the Sun 's ultraviolet ( UV ) radiation . It contains high concentrations of ozone ( O ) 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 20 to 30 kilometres ( 12 to 19 mi ) above Earth , although its thickness varies seasonally and geographically . </P>
what layer of the earth is the ozone in
what layer of the earth is the ozone in
stratosphere
stratosphere