Blue is the lazy assumption. At a lake's edge, light enters water as if it were auditioning for a different world, while suspended rock dust redirects the beams that return to the eye. Minerals rewrite the view. As glaciers grind bedrock, they make glacial flour, and its particles favor shorter wavelengths through Mie scattering, yielding water that can look turquoise, milky, or green. Where meltw...More