This photo of Palette Spring in Yellowstone National Park was taken a couple of days ago. The chalky white rock is travertine, a common deposit of hot springs. The grey rock is also travertine but is not wet. The orange colors and some of the pink hues are a result of the microorganisms that live in the hot water. Look carefully and you will see snow where the heat does not penetrate the rock sufficiently to cause it to melt. Yellowstone this time of year is quiet and peaceful with very few people.