النتائج (
الإنجليزية) 2:
[نسخ]نسخ!
Ozone hole What is the ozone hole? is a vacuum in the ozone gas in the atmosphere layer and that of her job protecting the Earth from harmful rays emitted by the sun to the earth. discovery of the ozone hole? There is this hole over the Antarctic was discovered in the late last century by Some British scientists, some scientists assert that the main reason is the emission of harmful gases from the earth. ozone depletion: possible depletion layer Alao hydroxyl (OH), chlorine (Cl) and gas bromine (Br). Where there are natural sources of all the elements mentioned, but Trkizghaz chlorine gas and bromine have increased significantly in recent years due to human production of some composite materials, especially CFC (chlorofluorocarbon), known simply as (CFCs) and also Bromovrukrbun. This stable compounds chemical can reach to the stratosphere, where she works UV to dismantle all of chlorine and fluorine .. all of them starts stimulating series of interaction capable to dismantle more than 100,000 molecules of ozone depleting substances in the northern part of the globe in the low 4% each decade. Almost more than 5% of the surface of the earth around the Arctic and Antarctic, most (but on a seasonal basis) may be reduced; This is what is called a b ozone hole proposed solutions to reduce ozone depletion: Sweden is the first country to prohibit the use of machine guns (such as pesticides) containing CFCs (CFC) on January 23, 1978. Followed by some countries such as the United States, Canada and Norway. The EC blocked a similar proposal. Even in the United States, the CFC gas is still used in other places such as refrigerators and detergents, even after the discovery of the ozone hole in the Antarctic in 1985. After talks and international treaty (Montreal Protocol), has been suspended production of CFCs (CFC) significantly starting from 1987 and fully in 1996. on August 2, 2003,, the scientists announce that the depletion of the ozone layer has started to slow down after the ban on the use of chlorofluorocarbons (CFC). Three satellites and three ground stations proved slow depletion of the ozone layer Supreme dramatically over the past decade. The study was conducted by the American Geophysical Union Organization (American Geophysical Union). Some decay is still based in the ozone layer due to the failure of some states to prevent the use of chlorofluorocarbons (CFC) in addition to the pre-existence in the stratosphere by preventing its use, where his long dissolution from 50 to more than 100-year period, and therefore need the ozone layer of the re-entry fully For several decades. currently being installed components contain (CH) to replace an alternative to the use of chlorofluorocarbons (CFC) such as Haedrocuruvrukrbun (HCFC), as these vehicles more activity Fortunately long enough do not remain in the atmosphere to reach the stratosphere where the impact on the ozone layer. the effect of the ozone hole to life the spread of skin cancer may be explained medical scientists to more than 7% of the incidence of skin cancer is positive and deadly, which is known as melanoma Melanoma genetic effect: when the human skin to a large amount of radiation exposed to ultraviolet radiation can damage occurs in the nuclei cells of the external skin of the skin Center acid nuclear occurrence of premature aging and poisoning the blood and nervous exhaustion ::: weakened immune system in the body and not to resist the spread of cancer tumors :: :: lack of agricultural crops on ultraviolet radiation effect on Fisheries :: livestock illnesses :: from Some global warming damage (greenhouse) (GHG): cause of global warming melting ice and increased sea ratio for the land, resulting in flooding and cover the edges of continents water may evolve into the sinking of the entire country under the surface of the water and these countries Activity scientific understanding why the hole occurrence and later other countries of aerobic and of biological contamination
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