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2004 photo: Morning Glory Pool hot spring in the Upper Geyser Basin of Yellowstone National Park, Wyoming, USA.

2004 photo: Morning Glory Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park, Wyoming, USA. Microbial mats of thermophilic (heat-loving) cyano-bacteria and algae color the pool brown, yellow, and green. The pool's center lacks the high temperature pure blue water seen in previous decades. Its glory has faded as objects tossed in by vandals have blocked hot water inlets. The rising groundwater of Morning Glory Pool is heated by a hotspot of light, hot, molten mantle rock near the surface. 640,000 years ago, a supereruption of the Yellowstone Supervolcano created the Yellowstone Caldera which measures 34 miles (55 km) by 45 miles (72 km). Any time in the next few hundred millennia, the active volcano of Yellowstone could cause vast destruction in North America and modify world climate. Yellowstone was the first national park in the world (1872), and UNESCO honored it as a World Heritage site in 1978.

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Wyoming: Yellowstone National Park
2004 photo: Morning Glory Pool is a hot spring in the Upper Geyser Basin of Yellowstone National Park, Wyoming, USA. Microbial mats of thermophilic (heat-loving) cyano-bacteria and algae color the pool brown, yellow, and green. The pool's center lacks the high temperature pure blue water seen in previous decades. Its glory has faded as objects tossed in by vandals have blocked hot water inlets. The rising groundwater of Morning Glory Pool is heated by a hotspot of light, hot, molten mantle rock near the surface. 640,000 years ago, a supereruption of the Yellowstone Supervolcano created the Yellowstone Caldera which measures 34 miles (55 km) by 45 miles (72 km). Any time in the next few hundred millennia, the active volcano of Yellowstone could cause vast destruction in North America and modify world climate. Yellowstone was the first national park in the world (1872), and UNESCO honored it as a World Heritage site in 1978.
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