Mammoth Hot Springs terraces. Hot water is the creative force of the terraces.Even though Mammoth Hot Springs lie north of the caldera ring-fracture system, a fault trending north from Norris Geyser B
Mammoth Hot Springs from above, where hot water flowing through an ancient fault has been building these terraces for thousands of years. The alien quality of this landscape is part of what makes Yellowstone feel like nowhere else. © Brocken Inaglory, CC BY-SA 3.0, via Wikimedia Commons

More on this story