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Reference Terms
from Wikipedia, the free encyclopedia

Ozone layer

The ozone layer is the part of the Earth's atmosphere which contains relatively high concentrations of ozone (O3). "Relatively high" means a few parts per million - much higher than the concentrations in the lower atmosphere but still small compared to the main components of the atmosphere.

Note:   The above text is excerpted from the Wikipedia article "Ozone layer", which has been released under the GNU Free Documentation License.
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