Bluish Yellowstone (Wyoming)
by Silvia Favaro, Università Milano Bicocca, Milano, Italy
Microorganisms in Yellowstone need extremes to survive: super hot water and an acidic or basic environment. These microorganisms are called thermophiles and, when the water reaches circa 100°C, they usually build the white masses shown in the picture.
Silvia Favaro (distributed via imaggeo.egu.eu)