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What You See Is Not What You Get: The Difference Between Sunlight and Ultraviolet Radiation
This article is from Issue Urban Forest - Vol. 6 No. 1.
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Scientists have known that there is a difference between the sun’s visible radiation and invisible ultraviolet radiation from the sun. Ultraviolet radiation is separated into 3 types: UVA, UVB, and UVC. The scientists in this study were interested in trees growing in urban areas. They wanted to know whether the shade that we can see under urban trees protects people from UVB radiation.
Welcome to the Urban Forests edition
Note to Educators
Urban Forest Lesson Plan
Reflection Section Answer Guide
Education Standards Correlations
Meet the scientists that contributed to this article:
"Science Topics" covered in this article:
"Environmental Topics" covered in this article:
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"Thinking About Science Themes" covered in this article:
Scientists use many ways to discover new knowledge. Sometimes collecting existing information from many sources and putting it together in one report is a valuable addition to science. This is similar to what you do when you write a paper using information from the library and the Internet. In this study, the scientists collected information from past research and added it to their own research findings. In this research, the scientists wanted to know how much is already known about ultraviolet radiation in urban areas.
Specific "Thinking About Science" Themes:"Thinking About Environmental Themes" covered in this article:
All life on Earth needs the sun because it is the original source of all of our energy and food. Sometimes, however, we can get too much of a good thing. Take ultraviolet radiation, for example. Ultraviolet radiation, or UV radiation, comes from the sun and is invisible. UV radiation is a part of the electromagnetic (e lek tro mag net ik) spectrum (figure 1). What makes UV radiation good? UV radiation causes the skin to create Vitamin D, which helps people to absorb calcium. A little bit of sunlight can also protect people from some kinds of nonskin cancers. Too much UV radiation, however, can be hazardous to human health. If you are going to be in the sun for a long time, use sunscreen or cover your skin. Some of the negative impacts of too much UV radiation include sunburn, eye damage, and skin cancer. Because too much UV radiation may damage a person's immune system, other cancers and diseases may be related to having too much sun exposure.
Specific "Thinking About the Environment" Themes:NSE Standards covered in this article:
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