In which major European city, there is a volcano that may soon erupt?

in Porto
in Heraklion
in Naples
in Palermo
Lying mostly underwater, Campi Flegrei comprises 24 craters. It is one of the largest volcanoes in the world, capable of producing VEI 7 (super-colossal) eruptions. Its most recent eruption of 1538 created a new hill, Monte Nuovo.
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Very interesting!
reach: rather globalcitiescities of Europecities of ItalydisastersEuropegeographygeography of ItalyItalynatural disastersvolcanoes

Answers by country

in Porto
in Heraklion
in Naples
in Palermo
answers
flagItaly
1%
2%
86%
10%
89
flagthe Netherlands
6%
4%
72%
16%
48
flagSwitzerland
2%
12%
72%
10%
47
flagFrance
0%
7%
71%
17%
28
flagGermany
3%
8%
69%
16%
402
flagAustria
4%
1%
69%
20%
68
flagGreece
3%
3%
69%
23%
55
flagthe United Kingdom
3%
10%
67%
17%
405
flagUnknown
8%
11%
66%
13%
36
flagPoland
3%
11%
64%
19%
29602
flagRepublic of Ireland
0%
8%
64%
27%
48
flagAustralia
3%
10%
63%
16%
77
flagthe United States
4%
12%
60%
20%
903
flagCanada
1%
9%
59%
26%
64
flagBelarus
10%
14%
59%
16%
49
flagUkraine
10%
10%
56%
20%
426
flagIndia
10%
16%
56%
14%
146
flagRussia
6%
10%
51%
28%
282
flagSpain
4%
8%
48%
40%
25
flagthe Philippines
20%
24%
34%
13%
29