200 million years ago, the history of volcanic eruptions created the largest ozone hole.

<P Align=center> </ P> <P align=center> profile picture: 2006 Antarctic ozone hole has appeared (Source: NASA website) </ P> World Scientific reports [tech.] News: Beijing in June .4, according to the British "Times" reported that the British researchers say, appear on the Earth's history the largest ozone hole is not as humans, but 251 million years ago a volcanic eruption "created". .<P Align=left> around the ozone hole in the earth around the equator, extending to Portugal as far north central, south as far as extending to southern Argentina. .It is because of volcanic eruptions in Siberia, and the eruption was the largest on Earth extinction tragedy to accelerate the destruction of countless plant and animal species. .</ P> <P align=left> calculated according to the scientists, the ozone hole pierced the strong ultraviolet radiation through the human use up freon and other chemicals produced in the UV ozone hole 6 times. .These have been in the Permian - Triassic age ozone-depleting chemicals, once to stop the "invasion" atmosphere, the destruction of the ozone layer takes about 10 years to be restored. .Human emissions to the atmosphere ozone-depleting chemicals evil time to longer. .</ P> <P align=left> David graduated from the University of Sheffield research team led by Professor Hauling in the "Philosophical Transactions of the Royal Society," published their findings. .</ P> </ p>.