- published: 14 Sep 2016
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The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth's atmosphere as a whole is only about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) above Earth, though the thickness varies seasonally and geographically.
The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer (the Dobsonmeter) that could be used to measure stratospheric ozone from the ground. Between 1928 and 1958, Dobson established a worldwide network of ozone monitoring stations, which continue to operate to this day. The "Dobson unit", a convenient measure of the amount of ozone overhead, is named in his honor.
Around 30 years ago, scientists found a massive and growing hole in the ozone layer. How's it doing today? Why Is There Air? - https://www.youtube.com/watch?v=ocsV1cA4K4A Sign Up For The Seeker Newsletter Here - http://bit.ly/1UO1PxI Read More: Ozone http://earthobservatory.nasa.gov/Features/Ozone/ozone_2.php "When high-energy ultraviolet rays strike ordinary oxygen molecules (O2), they split the molecule into two single oxygen atoms, known as atomic oxygen. A freed oxygen atom then combines with another oxygen molecule to form a molecule of ozone." Ozone layer on the mend, thanks to chemical ban http://www.sciencemag.org/news/2016/06/ozone-layer-mend-thanks-chemical-ban "The Antarctic ozone hole has been a potent symbol of humankind's ability to cause unintended environm...
Think of the ozone layer as Earth's sunglasses, protecting life on the surface from the harmful glare of the sun's strongest ultraviolet rays, which can cause skin cancer and other maladies. Ozone stinks. People who breathe it gag as their lungs burn. The EPA classifies ground-level ozone as air pollution. Yet without it, life on Earth would be impossible. A fragile layer of ozone 25 km above Earth's surface is all that stands between us and some of the harshest UV rays from the sun. The ozone molecule O3 blocks radiation which would otherwise burn skin and cause cancer. On Mars, which has no ozone layer to protect it, solar UV rays strafe the surface with deadly effect, leaving the apparently lifeless planet without the simplest of organic molecules in the upper millimeters of exposed...
http://mocomi.com/ presents: What is Ozone layer? Life on earth is protected from the UV rays by a layer in the upper atmosphere (known as the stratosphere), which surrounds earth. This layer is called the Ozone layer. Ozone is a gas made up of three oxygen atoms (O3) much like the layer of butter that settles on top if a glass of buttermilk is left unattended for a while. This layer is just about 3-5mm thick. This thinly spread-out gas has been protecting life near the earth’s surface from the sun’s harmful UV rays for billions of years. Ozone is spread thinly throughout the stratosphere in low quantities. Watch this animated video to understand Why is the ozone layer in danger? and What is the ozone hole? To learn more about the ozone layer, go to http://mocomi.com/what-is-the-ozo...
Restrictions on chemicals credited in ozone-hole shrinkage. Learn more: http://bit.ly/297xG9N Read the research ($): http://bit.ly/295yKtq
Subscribe to BBC News www.youtube.com/bbcnews The Earth's protective ozone layer is starting to repair itself, according to a panel of United Nations scientists. The main reason behind its recovery, they say, is the fact that certain chemicals, such as those used in aerosol cans, were phased out in the 1980s. Roger Harrabin reports. Subscribe to BBC News HERE http://bit.ly/1rbfUog Check out our website: http://www.bbc.com/news Facebook: http://www.facebook.com/bbcworldnews Twitter: http://www.twitter.com/bbcworld Instagram: http://instagram.com/bbcnews
Visit http://science.nasa.gov/ for more. Almost 30 years after the Montreal Protocol put the brakes on ozone-depleting chemicals, one compound remains stubbornly and mysteriously abundant in the atmosphere. NASA scientists are tracking down the source and studying its effect on the ozone layer.
Visit http://www.makemegenius.com for more,free science videos for kids. Along-with beneficial rays from sun, there many harmful rays also which come from the sun.These harmful rays are known as ultraviolet rays ( uv rays) .If human skin is exposed too long to UV rays, it can cause cancer. But good news is that most of the harmful UV radiation is absorbed by a layer of ozone gas 20 -- 50 km above the Earth. But few human made chemicals are releasing few gases which are depleting the ozone layer.This video explains the whole ozone layer composition & depletion in an interesting way.
Visit http://www.makemegenius.com for free science videos for kids. Global warming can be defined as heating of earth because of increase in green house gases ((carbon dioxide, water vapor, nitrous oxide, and methane).These gases trap more heat from the sunlight reflected by earth ,so temperature of the earth goes up.This may hurt all living beings.In this educative video,find all answers to the questions about what is global warming ,what is ozone layer,what is greenhouse effect etc.
The Arctic region, around the North Pole, is an important indicator of the impacts of industrial and human activities, both at the surface level and in the atmosphere. The rapid warming of the region has attracted considerable scientific attention. Besides the well known phenomenon of global warming occurring in our lower atmosphere, another atmospheric phenomenon had been taking place over the Arctic. Recent record low ozone values in the stratosphere have led scientists to take a closer look at the links between the changing climate and ozone distribution; changes that may undermine the recovery of the Ozone layer predicted to occur in a few decades. This 17 min. documentary was produced by the United Nations Environmental Program.
No sunbathing without sunscreen - that was a mantra for sun worshippers back in the 1980s. The reason: The sun's dangerous UV-radiation passes through massive holes in the Earth's ozone layer and strikes the Earth surface - and our skins - nearly unhindered. Today, we are still busy drenching ourselves in suncream, but it's got quiet about ozone holes. Just what happened to them? More information on: http://www.ideasforacoolerworld.org