According to the Yellowstone Volcano Observatory, it’s probable that this new hydrothermal feature is connected to activity ...

The Midway Geyser Basin's Grand Prismatic Spring is the largest hot spring in Yellowstone and one of the largest hot springs in the world. Measuring approximately 370 feet in size and around 121 ...

Yellowstone also contains a number of prismatic springs - pools of nearly boiling hot water named after their coloration. The springs have bands of orange, yellow, green and blue - the result of ...

Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in North America and the third-largest in the ...

How the Grand Prismatic Spring Gets Its Kaleidoscopic Colors The beating heart of Yellowstone National Park is without a doubt the Grand Prismatic Spring—the largest hot spring in the U.S.

Today, Yellowstone remains a place of low volcanic risk. Sure, there are sometimes small explosions stoked by hot water and ...

Yellowstone National Park has a new thermal vent spewing steam in the air that could be visible to tourists once visitors ...

Yellowstone National Park is a place where steam rises from the earth and geysers erupt like clockwork. Parameters were ...

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...

Millions of people visit Yellowstone National Park’s hot springs. There’s Grand Prismatic, the park’s largest and brightest spring known for its deep orange, yellow and turquoise colors; Mammoth Hot ...