The town of Armero was buried by thick volcanic mudflows in 1985 (Wikimedia Commons) It was November 13, 1985, when the Nevado del Ruiz volcano in Colombia erupted after months of seismic rumblings.

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Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland ...