How does a rainbow form?
Here are several answers for that:
(Broken Link Removed)
http://www.rebeccapaton.net/rainbows/formatn.htm
http://www.cs.dartmouth.edu/farid/sciencekids/rainbow.html
(Broken Link Removed)
http://www.rebeccapaton.net/rainbows/formatn.htm
http://www.cs.dartmouth.edu/farid/sciencekids/rainbow.html