Why Do Rainbows Occur?

Answer

Rainbows occurs as an effect of sunlight rays passing through rain droplets. It is a prism effect that leads to white lights being dispersed to a spectrum of the seven colours. The rainbow usually appears at the opposite side of the sun.
Q&A Related to "Why Do Rainbows Occur"
Rainbows are caused by light refracting off moisture drops in the air and the colors are caused by the fact different colours ( wavelengths) of light are refracted by different amounts
http://wiki.answers.com/Q/Why_do_rainbows_occur
Rainbows appear when the sun shines through water droplets. It often appears while the sun is
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Chemical reactions occur because different types of molecules interact with each other to create new substances. Many of these interactions happen naturally and are not man-made.
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This should help you out! http://en.wikipedia.org/wiki/Rainbow. Source(s) wikipedia reference site.
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2 Additional Answers
Rainbows occur when light passes through the tiny droplets of water in the atmosphere. The light reflects off the opposite sides of the droplets and bounces back to the entry side. The angle at which it bounces back determines what color it will be in the rainbow. You can find more information here: http://www.wisegeek.com/why-do-rainbows-form.htm
Rainbows appear when rain drops reflect sunlight, which breaks white sunlight into colors. To see a rainbow, you must have your back to the sun and rain must be falling in some part of the sky. You can find more information here: http://sci.odu.edu/sci/Scire/05Edition/rainbow.html
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