Ozone Layer

What is Ozone Layer?

Ozone Layer meaning in Science terminology / glossary / dictionary is:
The layer of ozone that begins approximately 15 km above Earth and thins to an almost negligible amount at about 50 km, shields the Earth from harmful ultraviolet radiation from the sun. The highest natural concentration of ozone (approximately 10 parts per million by volume) occurs in the stratosphere at approximately 25 km above Earth. The stratospheric ozone concentration changes throughout the year as stratospheric circulation changes with the seasons. Natural events such as volcanoes and solar flares can produce changes in ozone concentration, but man-made changes are of the greatest concern. See stratosphere, ultraviolet radiation.

 

reference: Enviromental Protection Agency Unites States

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Ozone layer

What is Ozone layer ?

Ozone layer is (noun) a layer of ozone in the upper atmosphere, formed by the action of sunlight on oxygen, which acts as protection against harmful rays from the Sun

 

source: Easier English, Student Dictionary Upper Intermediate Level