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
0%
1%
88%
10%
70
flagAustria
0%
0%
76%
17%
39
flagFrance
0%
4%
71%
19%
21
flagGermany
3%
8%
69%
18%
255
flagGreece
2%
4%
69%
23%
42
flagthe United Kingdom
3%
11%
67%
16%
327
flagRepublic of Ireland
0%
11%
67%
20%
34
flagUnknown
8%
11%
66%
13%
36
flagSwitzerland
3%
15%
66%
12%
33
flagthe Netherlands
8%
5%
65%
20%
35
flagPoland
3%
11%
64%
19%
28148
flagCanada
1%
10%
61%
22%
57
flagUkraine
8%
8%
60%
21%
236
flagthe United States
4%
13%
59%
21%
811
flagAustralia
4%
12%
58%
17%
63
flagIndia
10%
16%
56%
14%
132
flagBelarus
10%
18%
56%
13%
37
flagRussia
5%
12%
49%
29%
196
flagSpain
4%
9%
47%
38%
21
flagthe Philippines
22%
25%
37%
7%
27