1. What is Ultraviolet Radiation? By Morgan B. Table of Contents

2. Title page Science info Vocab. Related links Table of Contents

3. Introduction I n this presentation you will find information on Ultraviolet radiation, also known as UV rays. While exploring you will find a science page filled with anything you wish to know about Uv rays. Next you will find a vocabulary page, just incase you are unsure of any words that you find in my presentation. The final thing you will find is a related links page. On this page you will find websites that you can go to to learn extra information about UV rays. I hope you enjoy my presentation! Next page Table of contents

4. Science Info  Has anyone ever told you that the ozone is depleting and we are going through global warming? Well, this so called "global warming" is caused by ultraviolet radiation. There are three types of UV radiation the first is UVA. UVA rays are not absorbed my the ozone layer at all. This makes it dangerous to our health and causes some people to get skin cancer. Next page Table of contents

5. More Science  The next type of UV radiation is UVB. UVB rays are mostly absorbed by the ozone layer but not completely. Therefore some of the radiation gets to Earth's surface. This type of radiation is also dangerous to humans. Next slide Table of contents

6.  The last type of UV radiation is UVC. UVC rays are completely absorbed by the ozone layer and by oxygen. Next slide Table of Contents

7. Causes of Increase in Radiation  UV Radiation levels depend on a number of factors. The first being the time of day. When the sun is in the highest point of the sky the sun's rays have the least amount of distance to travel through the atmosphere and UVB levels are at their highest. However in the morning and in the late afternoon the the sun's rays pass through the atmosphere at an angle. This makes their intensity a lot lower. Next slide Table o contents

8. Time of Year  The next factor of UV levels depends on time of year. The suns angle changes with the seasons and this makes the suns intensity change. UV levels are highest during the summer because the sun's giving off the most direct rays. Next slide Table of contents

9. Latitude  The third factor that determines UV levels is latitude. At the equator the UV rays are the strongest because they are the most direct. The UV rays are also stronger because at the tropics the ozone layer is thinner then it is at higher latitudes. Next slide Table of contents

10. Altitude  The fourth factor of UV levels depends on altitude. UV strength is higher in higher altitudes because there is less atmosphere to absorb the rays. Next slide Table of contents

11. Weather Conditions  The next factor the UV levels depend on is the weather conditions. Cloud cover lessens UV levels. However, not completely. Depending on how thick the clouds are it is still possible for you to get sunburn. Next slide Table of contents

12. The finals cause of increased AUV levels is reflection. Snow, grass, water, and sand increase the risk of high UV levels because these surfaces reflect the sun. Next slide Tale of contents

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14. Vocabulary  Radiation - the process in which energy is emitted as particles or waves  Atmosphere - the gaseous envelope surrounding the earth; the air  Stratospheric ozone layer -part of the Earth ’ s atmosphere which contains relatively high concentrations of ozone  Radiation - the process in which energy is emitted as particles or waves  Atmosphere - the gaseous envelope surrounding the earth; the air  Stratospheric ozone layer -part of the Earth ’ s atmosphere which contains relatively high concentrations of ozone Next slide Table of contents

15. Related links US Environmental Protection Agency NAS Health Physics Society This site provided information on what causes UV levels to increase or decrease. This site provided me with information on UVA, UVB, and UVC rays. This site provided me with information about UV rays Mrs. Peck’s Website Other Biggie Questions Table of contents