Reference Terms
from Wikipedia, the free encyclopedia

Rainbow

A rainbow is an optical and meteorological phenomenon that causes a nearly continuous spectrum of light to appear in the sky when the Sun shines onto droplets of moisture in the Earth's atmosphere.

It takes the form of a multicoloured arc, with red on the outside and violet on the inside.

Note:   The above text is excerpted from the Wikipedia article "Rainbow", which has been released under the GNU Free Documentation License.
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August 29, 2015

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updated 12:56 pm ET