51.   Ozone is a thin layer of gas that protects the earth from damaging ultraviolet radiation.

52.   Physical sunscreens are opaque creams and liquids that leave a visible layer on your skin that reflects and scatters ultraviolet radiation.

53.   Postal authorities might also consider flooding the workplace with enough ultraviolet radiation to disable any anthrax floating in the air without harming workers.

54.   Researchers have also placed ultraviolet radiation sensors on the ground to see if there is an increase as the plume passes between the Sun and the ground.

55.   Q. How does ultraviolet radiation cause skin cancer?

56.   Scientists hope to learn whether meteor storms degrade the ozone shield protecting life on earth from harmful ultraviolet radiation.

57.   So the dissolved organic matter stays in the lake longer and becomes bleached by the ultraviolet radiation, Schindler said.

58.   So the astronomers propose that ultraviolet radiation could do the same thing to many organic molecules in space.

59.   Sredl said a recent study in Oregon showed that frogs can be sensitive to changes in ultraviolet radiation.

60.   Stratospheric ozone is essential in protecting humans from carcinogenic ultraviolet solar radiation.