Ring of Fire

Colorful bacterial mats create the rainbow rings that circle Grand Prismatic Spring, a Yellowstone National Park landmark and the largest hot spring inthe United States. This aerial view shows the full extent of the spring, which is about 300 feet (90 meters) wide at its widest point. The water gets about 160 feet (50 m) deep, but you dont want to take a dip, regardless at its center, the pool reaches temperatures of 160 degrees Fahrenheit (70 degrees Celsius).