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There was a series of eruptions on Etna in January and June which showered local villages with ash but caused no damage or injuries.Some believe this may be a prelude to the volcano's first significant eruption in six years.Etna's unusual location has confounded scientists for decades.Unless they're sitting on top of hot spots — plumes of superheated rock rising from deep in Earth's mantle — most volcanoes on Earth occur where tectonic plates move apart or crash together, with one plate sliding down under the other (called a subduction zone).C., but the volcano is much older, with the first lava flows pouring out 500,000 years ago.Thanks to geologic detective work, such as dating older lava flows, scientists know the volcano has had times of sleep. "There must have been periods when the volcano shut down, because otherwise, it would be a lot taller," Putirka said.The volcano erupted again this past weekend, tossing lava bombs that looked like fireworks from afar.The blast from Etna's New Southeast Crater is the latest in a string of spectacular eruptions.

She earned a master's degree in geology from Caltech, a bachelor's degree from Washington State University, and a graduate certificate in science writing from the University of California, Santa Cruz.

"At a fundamental level, there's a lot we still don't understand in terms of eruptions," Putirka said.

Becky Oskin covers Earth science, climate change and space, as well as general science topics.

"That sets up a convection current in the mantle that drives volcanism further inland." Etna's value as a natural volcanic laboratory earned the peak a World Heritage Site designation this past June.

Yet even after being observed constantly for more than 2,000 years, the mountain still holds many mysteries, Putirka said.

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