Source of water in the nature reserve Grand Prismatic Spring an der Grand Loop Rd in Yellowstone National Park in Wyoming, United States of America. In the blue center of steaming source the water is 80 degrees Celsius. Mats of cyanobacteria cover the cooler edge of the pool and the floor into the drain channels and color it green, yellow, orange and brown. The microorganisms need heat to life.
Pictures are searched.
2 aerial photos