Volcanologists are warning over the destructive power of the Phlegraean Fields, also known as Campi Flegrei, near to Naples, Italy, as it is showing signs of erupting. The huge volcano - technically an eight-mile wide caldera - which is mostly underwater in the Bay of Naples, is bigger than the nearby Mt Vesuvius – which is responsible for one of the deadliest eruptions in human history when it obliterated the nearby Pompeii in 79AD.
The ancient volcano last erupted in 1538 although it was only minor, lasting for eight days.
However, its formation some 39,000 years ago saw lava and rocks thrown hundreds of kilometres away in what was the most violent eruption in the past 200,000 years in Europe.
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Video at source shows the 11 major volcanoes that could erupt big time and taking millions of people with them.