When we visited the Black Sands Basin in Yellowstone National Park last month, we photographed the brilliant colors in the bottom of a small lake off the boardwalk. At the time, I did not realize that the lake is named Rainbow Pool but the colors, from bottom to top, are indeed the colors of the rainbow: Red, Orange, Yellow, Green, Blue, Indigo, Violet, aka ROYGBIV, an acronym I learned in my high school chemistry class. Although there’s no violet in this image, it is quite obvious how this pool got its name.

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