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%
85%
11%
97
flagSwitzerland
3%
10%
75%
8%
56
flagthe Netherlands
5%
3%
73%
17%
52
flagFrance
0%
7%
71%
17%
28
flagGermany
3%
9%
69%
16%
432
flagAustria
4%
1%
69%
20%
69
flagGreece
3%
3%
69%
23%
56
flagthe United Kingdom
3%
10%
67%
18%
420
flagUnknown
8%
11%
66%
13%
36
flagPoland
3%
11%
64%
19%
29804
flagAustralia
3%
10%
64%
16%
78
flagRepublic of Ireland
0%
7%
64%
27%
54
flagthe United States
4%
12%
59%
21%
917
flagCanada
1%
9%
59%
26%
64
flagBelarus
11%
13%
59%
15%
52
flagIndia
10%
16%
58%
14%
150
flagUkraine
10%
10%
57%
20%
438
flagRussia
6%
10%
52%
28%
298
flagSpain
3%
7%
50%
38%
26
flagthe Philippines
20%
24%
34%
13%
29