Search HowStuffWorks and the web:
 

Atmospheric sciences help us understand and predict the weather. Learn about topics such as the seasons, why it snows, and how rainbows are formed.

What is the UV index and how is it calculated?

Forward this article to five of your friends.

Your Name:

Your E-mail:

Friend #1 E-mail:

Friend #2 E-mail:

Friend #3 E-mail:

Friend #4 E-mail:

Friend #5 E-mail:

Your Message:



Please enter the characters you see above:
This helps HowStuffWorks prevent automated emails.

ADVERTISEMENT
Browse Browse Videos Browse Videos
 
  •  
    VIDEO SELECTIONS
     
WGBH NOVA
Elevator from Earth to Space?

 
MultiVu
Melanoma

 
MultiVu
Light Therapy Good For Skin

 
Reuters
What We Used Before Elevators

 
ScienCentral
Space Elevator

 
ScienCentral
Catching Melanoma

 
MediaLink
Long UV Rays More Dangerous Than Short

 
ScienCentral
How Not Getting Enough Sun Can Be Harmful

 
HowStuffWorks
How Sun Damage Works