This picture could finally explain the root cause of some of the world's most intense volcanic regions. (discovermagazine.com)
First Vitruvius, an engineer for the Emperor Augustus, and later Pliny the Elder recorded that the best maritime concrete was made with ash from volcanic regions of the Gulf of Naples (Pliny died in the eruption of Mt. Vesuvius that buried Pompeii), especially from sites near today's seaside town of Pozzuoli. (sciencedaily.com)
The soil in volcanic regions such as Kamwenge District contains crystals that irritate the feet. (newsweek.com)