Dormant For Years - Earth.com

Yes, Ear Spring, which is located on Geyser Hill in Wyoming, is the sleepiest of all the vents in the area. And over the past six decades, it has only erupted a handful of times. Before the September occurrence, it had been dormant for 14 years, having last exploded back in 2004. Photo credit: DANIEL SLIM / AFP / Getty Images

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