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Ozone layer
The ozone layer is a layer in the Earth's atmosphere that contains relatively high concentrations of ozone. It was discovered in 1913 and protects life on Earth by absorbing harmful ultraviolet radiation from the sun. Depletion of the ozone layer is caused by chemicals like chlorofluorocarbons that were used in aerosol sprays and refrigerants until their ban in the late 1970s. Ozone depletion increases UV radiation at the surface of the Earth and can potentially damage skin, eyes, and suppress immune systems.
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Ozone layer
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- 2. ď‚— The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone ď‚— The ozone layer was discovered in 1913 by the French physicists Charles Fabry and Henri Buisson. What is Ozone Layer?
- 3. ď‚— Although the concentration of the ozone in the ozone layer is very small, it is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation coming from the sun. Why it is important for Earth?
- 4. ď‚— In 1978, the United States, Canada and Norway enacted bans on CFC-containing aerosol sprays that are thought to damage the ozone layer. The European Community rejected an analogous proposal to do the same. Regulation
- 6. ď‚— http://www.educaplay.com/es/recursosed ucativos/675702/ozone_layer.htm Activities
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- 12. OZ OZ OZ Ozone
- 13. Ozone Layer in theatmosphere
- 14. The atmosphere The atmosphere is alayer around the Earth that mantains its gravity. And it also protects life in Earth by absorbing many sunrays.
- 15. The ozone layeris inside the Atmosphere, in the stratosphere. Which is after the troposphere and before the Mesosphere, the Ionosphere (thermosphere) and de Exosphere. The ozone layer in the atmosphere
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- 18. ď‚— The ozone layer is a layer which protects the Earth from the UV (ultra violet) radiations which are originated in the sun. This UV radiations can cause skin cancer, suppressions to the immune system and eye cataract.
- 19. ď‚— Today, the ozone layer is being destructed by the contamination produced in the Earth. As a consequence, many phenomena such as Global Warming or the Water Crisis are causing great damages on the Earth and in society.
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- 23. ď‚— Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth's stratosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone over Earth's polar regions. The latter phenomenon is referred to as the ozone hole. Ozone Depletion
- 24. ď‚— Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man- made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC). Chemicals in the atmosphere CFCs= Chemistry chlorofluorocarbon, any of a class of synthetic compounds of carbon, hydrogen, chlorine, and fluorine formerly used as refrigerants and aerosol propellants and known to be harmful to the ozone layer.
- 26. ď‚— As explained above, the primary cause of ozone depletion is the presence of chlorine- containing source gases (primarily CFCs and related halocarbons). In the presence of UV light, these gases dissociate, releasing chlorine atoms, which then go on to catalyze ozone destruction. The Cl-catalyzed ozone depletion can take place in the gas phase, but it is dramatically enhanced in the presence ofpolar stratospheric clouds (PSCs). Ozone hole and it causes
- 27. ď‚— Since the ozone layer absorbs UVB ultraviolet light from the sun, ozone layer depletion is expected to increase surface UVB levels, which could lead to damage, including increase in skin cancer. This was the reason for the Montreal Protocol. Although decreases in stratospheric ozone are well-tied to CFCs and there are good theoretical reasons to believe that decreases in ozone will lead to increases in surface UVB, there is no direct observational evidence linking ozone depletion to higher incidence of skin cancer and eye damage in human beings. Consequences of ozone layer depletion
- 28. ď‚— http://www.youtube.com/watch?v=UfyOJ b1widI http://www.educaplay.com/es/recursos educativos/675706/ozone_layer.htm http://www.youtube.com/watch?v=qUf VMogIdr8 Link of videos and an excersice: