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ozone layer
noun
: 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
Examples of ozone layer in a Sentence
Recent Examples on the Web
The ozone layer, a critical atmospheric shield, protects Earth from harmful ultraviolet radiation.
—Tom Howarth
follow, Newsweek, 1 Nov. 2024
The movement to repair the hole in the ozone layer – which began in the early 1970s and continued for over 20 years – is considered one of the most successful environmental initiatives ever.
—K.j. Yossman, Variety, 25 Oct. 2024
The ozone layer, Earth’s protective shield against harmful UV radiation, was vanishing.
—Dr. Alex Gold, Forbes, 9 Oct. 2024
The two planetary boundary processes stratospheric ozone depletion (the loss of the ozone layer due to chemicals like CFCs) and atmospheric aerosol loading (primarily driven by the incomplete combustion of fossil fuels) are currently within the green zone at a global scale.
—Johan Rockström, TIME, 2 Oct. 2024
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Word History
First Known Use
1927, in the meaning defined above
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Cite this Entry
“Ozone layer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ozone%20layer. Accessed 23 Nov. 2024.
Kids Definition
ozone layer
noun
: a layer of the earth's atmosphere at heights of about 20 to 30 miles (32 to 48 kilometers) that is normally characterized by high ozone content which blocks most of the sun's ultraviolet radiation from entry into the lower atmosphere
More from Merriam-Webster on ozone layer
Britannica.com: Encyclopedia article about ozone layer
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