photos: Hoh rainforest, 10-11 Sep 2005

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That blue Hoh River water -- I don't remember scattering mechanisms. Wikipedia says that glacial rock flour is "grains of a size between 0.002 to 0.00625 mm", 2000 - 6250 nm. I thought you needed to be smaller than the wavelengths of the light if you wanted preferential scattering of high frequencies. Help me out here?

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I could be convinced. I don't think of limestone as blue-green, but I don't know it very well. No idea what the Olympics are made of, either.