Grade Level/Unit Number: 7th grade/Unit 3 II: Unit Title: Weather & Atmosphere

Engage:

Students can complete the list of tasks as a class or give several beads to each student and assign tasks to be completed for homework.

1. 
   Do the beads change when in the sun, but under sunglasses?
   
2. 
   Do the beads change when submersed in sunscreen?
   
3. 
   Test the various SPF’s of sunscreen and the affect on the beads.
   
4. 
   Do the beads change when the sky is overcast or cloudy?
   
5. 
   Do the beads change when it is raining? (sprinkling vs. heavy rain)
   
6. 
   Do the beads change when in the sun, but submersed under water?
   
7. 
   Do the beads change inside a car? Do tinted windows affect the results?
   
8. 
   Do the beads change differently when on different colored surfaces, such as bright, dark or black construction paper?
   
9. 
   Do the beads change differently when on different materials, such as cotton, fleece, metallic, black, vinyl, felt….?
   
10. 
    Do the beads change under soil, or in a bush, or under a shaded tree?
    
11. 
    Do the beads change when placed under a tissue? If so, measure how many tissues it takes before no change occurs.
    
12. 
    Do the beads change when kept inside but held up to a window?
    
13. 
    Do the beads change when held under a shelter but a mirror is used to bounce sunlight onto the bead?
    
14. 
    Does the shade of the beads change based on the intensity of the light? (does more sun= brighter beads?)
    
15. 
    Do the beads change when held under fluorescent light, halogen light, a black light or a heat lamp?
    
16. 
    Do the beads change when exposed to tanning bed lights? (This one may be difficult to do- but is still interesting to find out!)
    
17. 
    Do the beads change when sheltered under different umbrellas such as dark, light, clear….?
    
18. 
    Do the beads change under plastic wrap, clear trash bags, or zipper bags?
    
19. 
    Will the beads change if closed in a clear jar or Ziploc container?
    
20. 
    Do the beads still change in the winter, or when it is snowing?
    
21. 
    Will the beads change in a microwave oven?
    

Purpose of lab: To have students investigate ultraviolet light. Even though it may not be sunny outside, people are still exposed to ultraviolet radiation. Necessary precautions must be taken in order to protect yourself from exposure. (both long term and short term) Allow students to write up their findings on the included lab report (attachment 1).

Sunlight is the greatest source of UV radiation. Man-made ultraviolet sources include several types of UV lamps. UV radiation is commonly used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, welding, phototherapy and sun tanning.

Who is at the highest risk for damage from the ozone?

1. 
   Children who spend a lot of time playing outdoors in the summer.
   
2. 
   Anyone who has asthma or other respiratory disorders.
   
3. 
   Adults of all ages who work vigorously outside.
   

Day 3