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Submitted by school1234 on December 3, 2007
- Category: English
- Words: 583
- Pages: 3
- Views: 96
- Popularity Rank: 1371
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Every spring, scientists announce the dimensions of the year s ozone hole over Antarctica. Currently, about 80% of the ozone layer disappeared from an area centered on Antarctica that was nearly the size of North America. This time of the year, however, it s the Northern Hemisphere that commands most attention. Ozone loss peaks during fall, when the Earth s angle of orbit to the sun puts the Northern Hemisphere almost directly in the path of the sun s deadliest radiation, which triggers ozone-destroying reactions in our atmosphere. Solar ultraviolet radiation has created a shield of ozone in the high stratosphere that absorbs the biologically dangerous mid-ultraviolet wavelengths. In...
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