Yellowstone National Park

Friday 04 April 2014 16:58 BST

'Sunset Lake' hot spring with it's unique colors in the Yellowstone National Park

In pictures: Yellowstone National Park

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In pictures: Yellowstone National Park

'Sunset Lake' hot spring in Yellowstone National Park

'Sunset Lake' hot spring with it's unique colors in the Yellowstone National Park

In pictures: Yellowstone National Park

Supervolcano in Yellowstone National Park

View of the 'Sunset Lake' hot spring with it's unique colors caused by brown, orange and yellow algae-like bacteria called Thermophiles, that thrive in the cooling water turning the vivid aqua-blues to a murkier greenish brown, in the Yellowstone National Park, Wyoming in 2011

AFP

In pictures: Yellowstone National Park

Supervolcano in Yellowstone National Park

View of the 'Crested Pool' hot spring with it's unique colors caused by brown, orange and yellow algae-like bacteria that thrive in the cooling water, turning the vivid aqua-blue to a murkier greenish brown, in the Yellowstone National Park

AFP

In pictures: Yellowstone National Park

Supervolcano in Yellowstone National Park

Cliff Geyser along Iron Creek in the Black Sand Basin in Yellowstone National Park in Wyoming

AFP

In pictures: Yellowstone National Park

'Grand Prismatic' hot spring in Yellowstone National Park

View of the 'Grand Prismatic' hot spring with it's unique colors caused by brown, orange and yellow algae-like bacteria called Thermophiles, that thrive in the cooling water turning the vivid aqua-blue to a murkier greenish brown in the Yellowstone National Park

In pictures: Yellowstone National Park

A geothermal pool in Yellowstone National Park

Yellowstone protects 10,000 or so geysers, mudpots, steamvents, and hot springs

In pictures: Yellowstone National Park

Yellowstone Lake in Yellowstone National Park

Tourists walk beside a hot spring and the partially frozen Yellowstone Lake at the West Thumb Geyser Basin in the Yellowstone National Park

In pictures: Yellowstone National Park

Midway Geyser Basin in Yellowstone National Park

Tourists stroll on a steamy boardwalk at Midway Geyser Basin in Yellowstone National Park in Wyoming

In pictures: Yellowstone National Park

'Old Faithful' geyser in Yellowstone National Park

'Old Faithful' geyser erupts on average every 90 minutes in the Yellowstone National Park

In pictures: Yellowstone National Park

Lower Falls in Yellowstone National Park

Lower Falls at the Yellowstone Grand Canyon in the Yellowstone National Park

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