USA, Wyoming:

Yellowstone's Steamboat Geyser Sees Rare Eruption (Phys.org)

Steamboat Geyser, in Yellowstone National Park 

erupts on Wednesday, July 31, 2013.

(AP Photo/Robb Long)

Yellowstone National Park's Steamboat Geyser—the world's tallest—has erupted for the first time in more than eight years.

Park geologist Hank Heasler says Wednesday night's nine-minute blast sent steaming hot water an estimated 200 to 300 feet in the air.

Unlike Old Faithful, which spews water like clockwork every hour-and-a-half, no one knows when Steamboat will erupt next.

In the past, it's gone as long as 50 years without a major event. In 1964, it erupted a record 29 times.

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