Backlit Mound Terrace steam with blue sky at Mammoth Hot Springs Yellowstone Park in winter

Blue sky; backlit; steam; Mound Terrace; Mammoth Hot Springs; Mound; Terrace; Yellowstone; winter; travertine; rock; calcium carbonate; ledges; terraces; snow; National Park; Wyoming; sulfur; bacteria; yellow; deposit; grow; flow; geothermal; heat; steps; hot; water; spring; mineral; limestone; microbes; microorganisms; yellow; colored; color; rock; stone