Molly+Gilles+and+Claire+Schrock

=Sunscreen Effectiveness= No need to include "testing". Ms. Miller

**Problem:**
Does the level of SPF make a significant difference in protecting skin from UV rays?

Background/Purpose:
UV rays are invisible to the eye and they also have a higher energy then(sp) visible light. Most forms of skin cancer are caused by damage done by UV rays and overexposure to sunlight. S kin cancer among people who are sensitive to sunlight is more common in regions with stronger sunlight. Studies show that ultraviolet radiation similar to sunlight causes skin cancer in animals. Sunscreen is supposed to help protect your skin from the harmful UV rays and the higher the level of SPF(Sun Protection Factor), the more protection is provided. The SPF number is the level of protection the sunscreen provides against UVB rays − a higher number means more protection. We will find out how much of a difference SPF levels make in protecting your skin from harmful UV rays that could potentially cause skin cancer and permanently damage your skin. Write in a passive voice. Ms. Miller

Hypothesis:
If the sunscreen has a high SPF, then there will be less exposure of UV rays.

Materials:

 * UV monitor($39.95)
 * plastic wrap($2.99)
 * 2 bottles of sunscreen with SPF 15($12)
 * 2 bottles of sunscreen with SPF 30($12)
 * 2 bottles of sunscreen with SPF 50($12)
 * Sunlight

Procedure:
1. First we will cut a piece of 3x5 inches of plastic wrap and place it on the UV monitor, securing it with tape on the bottom. 2. Next we will take measurements of each UV index reading of the plastic without sunscreen applied to it, in order to know how much UV radiation it is being exposed to. 3. Next we will cover the plastic wrap with 1/2 a tablespoon of one kind of sunscreen, we will allow the lotion to dry and take the UV reading from the monitor after 10, 30, and 60 minutes. We will be recording all measurements. 4. Next we will subtract the empty plastic reading from the plastic+sunscreen reading. This result will show how much the sunscreen reduced the UV index. 5. Next we will repeat the measurements for each sunscreen we are testing. (SPF 15, 30 and 50) 6. Once we've gone through all of the lotions once, we will go back and repeat the procedure once again to make sure we are accurate. 7. Next we will calculate the average UV Index reduction for each sunscreen by adding the values from our three independent measurements and dividing the result by three. 8. Finally we will compare the UV Index reduction for each SPF that we recorded.

"What Is Ultraviolet (UV) Radiation?" What Is Ultraviolet (UV) Radiation? American Cancer Society, 25 Jan. 2013. Web. 25 Oct. 2013. < [|__http://www.cancer.org/cancer/cancercauses/sunanduvexposure/skincancerpreventionandearlydetection/skin-cancer-prevention-and-early-detection-what-is-u-v-radiation__] >.

Morison, Warwick L., MD, MB. "Sun Screen: Safe and Effective?" Sunscreens: Safe and Effective? American Cancer Society, 12 June 2012. Web. 25 Oct. 2013. < [|__http://www.skincancer.org/prevention/sun-protection/sunscreen/sunscreens-safe-and-effective__] >.

CCOHS. "Common Menu Bar Links." Skin Cancer and Sunlight : OSH Answers. Canadian Center for Occupational Health and Safety, 2 Apr. 2012. Web. 25 Oct. 2013. < [|__http://www.ccohs.ca/oshanswers/diseases/skin_cancer.html__] >.

Don't forget to include the budget for your materials. -Lily Maxwell Sunscreen wears off over time, how long will it be exposed in the sunlight?-Lily Maxwell

You could try to use a popular brand and a store brand to see if there is any differences. -Alexa Thompson Also you could see which sunscreens last after being on wet skin. -Alexa Thompson

Which brand of sunscreen will you be using? The brand could effect the results. Maybe look up which brand is most popular. -Kylie Ashton

What is considered a high SPF, need to be more specific.- Kelly Glick How long will the plastice wrap be exposed to sunlight? And how will you make sure that the same amount of sunlight is the same for all the different tests?- Kelly Glick