Blue Thermophile Hot Spring, Yellowstone Royalty-Free Stock Image

At Yellowstone National Park, the eye is drawn to the dark volcanic vent in this turquoise-blue thermal hot spring. The water is tinted blue by thermophile (heat-loving) bacteria that inhabit water that would burn humans. Steam in the image suggests the intese heat of the water. Pharmaceutical companies use thermophiles in reseach to find new medicines and therapies. Tourists flock to Yellowstone Park to see these colorful hot springs.