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Studying active volcanoes can be dangerous, which is why a group of scientists from around the world came together to simulate volcanic blasts. What they're learning will help them at a real eruption. NPR hide caption

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NPR

Ash spewing from Mount Etna is seen from the Italian city of Catania on Monday. A 4.8 magnitude earthquake followed, early Wednesday morning. Marco Restivo/Barcroft Media via Getty Images hide caption

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Marco Restivo/Barcroft Media via Getty Images

Lava advances west on Leilani Avenue on May 27. U.S. Geological Survey hide caption

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U.S. Geological Survey

Hawaii's Volcanic Eruption Draws Scientific Interest

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Lava cascades down the slopes of Mount Mayon on Tuesday as it erupts for a second day, seen from Legazpi city, Philippines. Thousands of villagers were evacuated amid warnings that a violent eruption could be imminent. Bullit Marquez/AP hide caption

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Bullit Marquez/AP

An Indonesian farmer passes a field as Mount Sinabung volcano spews thick smoke into the air in Karo, North Sumatra, earlier this month. The volcano roared back to life in 2010 for the first time in 400 years. After another period of inactivity it erupted once more in 2013, and it has remained highly active since. Ivan Damanik/AFP/Getty Images hide caption

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Ivan Damanik/AFP/Getty Images

The lava flow from Kilauea Volcano crossed Apa'a Street near Cemetery Road, near the town of Pahoa on the Big Island of Hawaii, on Friday. The flow began June 27; residents in the flow path have now been told to prepare for a possible evacuation. U.S. Geological Survey/AP hide caption

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U.S. Geological Survey/AP

Sicily's Mount Etna early this week, as seen from space. The bright red is lava. Snow is blue-green. Clouds are white. "Shortwave infrared, near infrared, and green light" combine to produce the colors. NASA hide caption

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NASA