91.   Ozone in the upper atmosphere forms a protective layer that helps block dangerous ultraviolet radiation from the sun.

92.   Ozone in the upper atmosphere forms a protective layer, helping block dangerous ultraviolet radiation from the sun.

93.   Ozone, a gas in the stratosphere, plays a key role in shielding humans, animals and plants from dangerous forms of ultraviolet radiation.

94.   Ozone gas in the stratosphere plays a key role in shielding people, animals and plants from dangerous forms of ultraviolet radiation.

95.   Ozone screens out ultraviolet radiation that can cause skin cancer and cataracts, and damage crops.

96.   Ozone, a gas in the stratosphere, plays a key role in shielding humans, animals and plants from the dangerous forms of ultraviolet radiation.

97.   Ozone, a gas, plays a key role in shielding people, animals and plants from dangerous forms of ultraviolet radiation.

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

99.   Although they use condoms, they still make their bodies as an ultraviolet radiation absorbent to nuclear and other radiation.

100.   An increase in ultraviolet radiation in the more heavily populated northern countries could be dangerous to many people.