1.   More water has been destroyed by ultraviolet sunlight, torn apart into oxygen and hydrogen.

2.   And many contagions, such as plague, break down surprisingly quickly when exposed to heat and to ultraviolet sunlight, he said.

3.   Alternatively, the ethane may have been created since the beginning of the solar system by the reaction of ultraviolet sunlight on primordial methane.

4.   Ultraviolet sunlight appears to be energizing chemical reactions in the atmosphere that produce an organic soup of carbon, hydrogen, nitrogen and oxygen compounds.

5.   Exposure to ultraviolet sunlight in India and areas near the equator is believed to cause a higher incidence of cataracts.