11.   High in the atmosphere, ozone forms a shield that protects the Earth from harmful solar rays.

12.   High-altitude ozone is a heavy form of oxygen gas that protects animal and plant life from harmful solar rays.

13.   If a rocket actually creates a hole in the ozone layer through which it travels, the people below may be exposed to greater amounts of harmful ultraviolet rays.

14.   If the answer is that nothing happens, why did Zaccanelli bother going to Maui, what with the dangers of harmful UV rays and all?

15.   In this piece it is illuminated by sunlight brought into the museum by fiber-optic cable and cleansed of harmful ultraviolet rays.

16.   It blocks the most harmful ultraviolet rays from the sun, protecting plant and animal life.

17.   It is less transparent than clear glass so it is effective in filtering out the harmful rays of the sun.

18.   Noxious ground-level ozone is different from beneficial stratospheric ozone, which shields the planet from harmful ultraviolet rays.

19.   Ozone in the stratosphere shields living organisms from harmful ultraviolet rays.

20.   The ozone layer prevents harmful ultraviolet rays from reaching the earth.