Hot springs are the most common of Yellowstone National Parks thermal features. They are directly connected to the Yellowstone hotspot, 1.5 to 3.0 miles beneath the surface, by cracks and fissures in the earth, that provide pathways for hot water to reach the surface.. The colorful aprons that surround the hot springs are actually different species of algae and bacteria, called thermophiles, that are adapted to live in hot water. As the water flows away from the hot spring it cools, allowing different thermophiles to survive in the different water temperatures.
From my ebook: Signatures