Mammoth Hot Springs is one of the largest thermal features in Yellowstone National Park. The limestone beneath the hot springs is dissolved in the hot water and brought to the surface where it creates white terraces. Heat-loving microorganisms add color to the steaming water that flows over the terraces or collects in pools within them. The site consists of Upper and Lower terraces, and activity within any are can change from day to day. These photos are from several locations along the Upper Terrace. Yellowstone is located in the Rocky Mountains of the western USA.
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