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%
10%
82
flagSwitzerland
2%
11%
72%
11%
43
flagthe Netherlands
6%
4%
71%
17%
45
flagFrance
0%
7%
71%
17%
28
flagAustria
1%
1%
70%
22%
57
flagGreece
3%
3%
68%
24%
54
flagGermany
4%
9%
67%
17%
343
flagthe United Kingdom
3%
11%
66%
17%
362
flagUnknown
8%
11%
66%
13%
36
flagRepublic of Ireland
0%
8%
65%
26%
46
flagPoland
3%
11%
64%
19%
29110
flagthe United States
4%
12%
60%
20%
873
flagAustralia
4%
11%
60%
18%
70
flagCanada
1%
9%
60%
24%
61
flagIndia
10%
16%
57%
14%
142
flagUkraine
10%
9%
56%
21%
371
flagBelarus
11%
15%
56%
15%
44
flagRussia
6%
11%
49%
29%
255
flagSpain
4%
8%
47%
39%
23
flagthe Philippines
22%
25%
37%
7%
27