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www.albany.edu/faculty/rgk/atm101/ozone.htm

Formation of the Ozone Layer Over two billion years ago, early aquatic organisms called blue-green algae began using energy from the Sun to convert molecules of water (H 2 O) and carbon dioxide (CO 2) and recombine them into organic compounds and molecular oxygen (O 2).This solar energy conversion process is known as photosynthesis.

science.howstuffworks.com/.../green-science/ozone-layer1.htm

Thankfully, the ozone layer protects us from most of the sun's harmful UV rays. Ninety percent of the atmospheric ozone is in the earth's stratosphere-- the altitude starting at six to 11 miles (9.6 to 17.7 kilometers) above the earth and extending to about 30 miles (48.3 kilometers) above the earth [source: Fahey].The stratosphere provides a natural setting conducive to the formation of t...

en.wikipedia.org/wiki/Ozone_layer

The ozone layer or ozone shield is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation. It contains high concentration of ozone (O 3) 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 Ear...

ozone.meteo.be/meteo/view/en/1547746-Formation+of+ozone.html

Ozone is a gas found in the atmosphere consisting of three oxygen atoms: O 3.Ozone is formed in the atmosphere when energetic ultraviolet (UV) radiation dissociates molecules of oxygen, O 2, into separate oxygen atoms.Free oxygen atoms can recombine to form oxygen molecules but if a free oxygen atom collides with an oxygen molecule, it joins up, forming ozone.

www.whatarethe7continents.com/the-ozone-layer-what-how...

There are many features of our world that make the planet especially well-suited to life on Earth. Among the most outstanding of these features is the Ozone Layer. An invisible barrier that protects us every day without us thinking about it. The ozone layer is an amazing occurrence on planet earth that helps support life.

www.toppr.com/guides/chemistry/environmental-chemistry/ozone

All of us are aware of how the concern related to depletion of ozone layer and the ozone hole, which also led to the ban of many chemicals such as the chlorofluorocarbon (CFC). Depletion of O3 can increase UV radiation entering Earth surface. This threatens the entire life on earth.

www.esrl.noaa.gov/csd/assessments/ozone/2010/twenty...

oxide gases, as well as ozone itself, and all require sunlight for completion. Fossil fuel combustion is a primary source of pollutant gases that lead to tropospheric ozone produc-tion. The production of ozone near the surface does not sig-nificantly contribute to the abundance of stratospheric ozone.

helpsavenature.com/ozone-layer-depletion-effects-causes

The ozone layer is responsible for absorbing harmful ultraviolet rays, and preventing them from entering the Earth's atmosphere. However, various factors have led to the depletion and damage of this protective layer. Learn more about the process, causes, and effects of ozone layer depletion.

en.wikipedia.org/wiki/Ozone

The shorter portion of this band and even more energetic UV causes the formation of the ozone layer, when single oxygen atoms produced by UV photolysis of dioxygen (below 240 nm) react with more dioxygen. The ozone layer itself then blocks most, but not quite all, sunburn-producing UVB (280–315 nm).