The national park said Tuesday that Giantess Geyser, one of its large geysers, "roared back to life" after more than six and a half years of dormancy.
The Giantess Geyser, which is located in Wyoming, historically erupted two to six times per year, according to the National Park Service (NPS).
"Why geysers turn off and on is something that is not well understood," the USGS tweeted. "They are very fragile systems."
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The Giantess Geyser, which is located in Wyoming, historically erupted two to six times per year, according to the National Park Service (NPS).
"Why geysers turn off and on is something that is not well understood," the USGS tweeted. "They are very fragile systems."

Yellowstone's Giantess Geyser erupts for first time in 6 years, roars 'back to life'
After a slumber that stretched for more than six years, a geyser at Yellowstone National Park erupted once again last week.