The Solfatara di Pozzuoli is one of the forty volcanoes that make up the Campi Flegrei and is located about three kilometers from the city center of Pozzuoli. It is an ancient volcanic crater still active but in a quiescent state that for about two millennia preserves an activity of fumaroles of sulfur dioxide, jets of boiling mud and high soil temperature: other similar activities are also found in other parts of the world and are indicated with the name of sulfate just for the similitude with that puteolana. Today, the Solfatara is a magma relief valve present under the Campi Flegrei, thanks to which it is possible to maintain a constant pressure of the underground gases.
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