ON THE WEB: A VERY RARE RAINBOWYou all know what a rainbow looks light, right? A curve, or arch in the sky, where light separates out into its component colors. But did you know there's another kind of rainbow, that shows up much more rarely? It goes by the name of a circumhorizontal arc, and there's a fabulous picture of one on the National Geographic web site. This page also explains how these very rare rainbows are created. |