11.   The chemicals have been linked to a deterioration of the ozone layer that shields the earth from harmful ultraviolet radiation.

12.   Ozone, a gas in the stratosphere, protects Earth from harmful ultraviolet radiation.

13.   Also, a scanner will measure potentially harmful radiation around the satellite.

14.   Depletion of the ozone layer over Antarctica and the Arctic is being monitored because ozone protects Earth from harmful ultraviolet radiation.

15.   Depletion of the ozone layer over the Arctic and Antarctica is being monitored because ozone protects Earth from harmful ultraviolet radiation.

16.   Dozens of people are believed to have been exposed to less harmful radiation in the accident, which set off an uncontrolled atomic reaction.

17.   Ozone, a gas in the stratosphere, prevents harmful ultraviolet radiation from reaching the Earth.

18.   The ozone layer shields the Earth from harmful ultraviolet radiation.

19.   They also say it would emit harmful radiation and make the town a military target.

20.   There may be yet another thin area in the ozone layer protecting the earth from harmful radiation, in the remote Tibet-Qinghai plateau, Chinese scientists say.