Just south of the village of Mammoth (where Tammy and I had a close-up view of an Elk herd) are the Mammoth Hot Springs Terraces. The terraces are formed when hot water carrying dissolved limestone is cooled, forcing the limestone to solidify.
The first three pictures are terraces formed from the active spring. The water from the spring had moved into a stand of trees. The steam from the hot water, the dead trees and the colored terraces gave this place quite an otherworldly feel. The fourth picture is of a "dead", bleached out terrace. It is no longer supplied with hot water because the springs have moved.