Dictionary

ozone layer

noun

: a layer of ozone in the upper atmosphere that prevents dangerous radiation from the Sun from reaching the surface of the Earth

Full Definition of OZONE LAYER

:  an atmospheric layer at heights of about 20 to 30 miles (32 to 48 kilometers) that is normally characterized by high ozone content which blocks most solar ultraviolet radiation from entry into the lower atmosphere

First Known Use of OZONE LAYER

1929

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