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A thermal video of a pyroclastic flow taken at the Soufrière Hills volcano in Montserrat in November 2009. The bottom layer features a chaotic mass of lava rocks, said Janine Krippner, a volcanologist at Concord University, while hot gas and sandlike ash rises above.

A thermal video of a pyroclastic flow taken at the Soufrière Hills volcano in Montserrat in November 2009. The bottom layer features a chaotic mass of lava rocks, said Janine Krippner, a volcanologist at Concord University, while hot gas and sandlike ash rises above.

Credit: Image by Marc Bernstein/Montserrat Volcano Observatory/Via PBS NewsHour

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From the article: What Made Guatemala’s Fuego Volcano Eruption So Deadly?

A thermal video of a pyroclastic flow taken at the Soufrière Hills volcano in Montserrat in November 2009. The bottom layer features a chaotic mass of lava rocks, said Janine Krippner, a volcanologist at Concord University, while hot gas and sandlike ash rises above.