7 · en
Short, simple sentences with “ultraviolet”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Avoiding prolonged exposure to ultraviolet radiation is crucial.
Using sunscreen reduces the damage caused by ultraviolet radiation.
When researchers at Rutgers University in New Jersey gave green tea to mice with skin cancer (caused by ultraviolet light), the disease was reduced by almost half.
A prospective study by computer scientists shows that the level of ultraviolet rays reaching the Earth will increase dangerously in certain areas between 1980 and 2060. You can see the difference in the period from 1960 to 1980.
The excess oxygen that polluted the world at that time had an important consequence: between 15,000 and 65,000 metres in the atmosphere, the sun's powerful ultraviolet B and C radiation began to transform diatomic oxygen (O2) into triatomic oxygen, or ozone gas (O3).
Without ozone in the stratosphere, life on earth would not exist, as it protects the planet's surface from ultraviolet rays and their deadly effects on living organisms. The radiation can break DNA itself, as well as cause cataracts, skin cancer, immune deficiency, crop failure and disruption of ecosystems.
Ozone is formed when hard ultraviolet rays - very short wavelengths - break oxygen molecules in two, resulting in free oxygen atoms that rejoin with some of the abundant oxygen molecules, forming the valuable gas. This photochemical activity produces about 5000 molecules per second, which concentrate to form the ozone layer which, due to chlorofluorocarbons, is on the verge of extinction.
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