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How many active volcanoes are there in Italy? (That have erupted during the last 100 years)

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These are Vesuvius, Etna and Stromboli. There are several other volcanoes considered dormant, of which 7 erupted in historic times (Vulcano 1890, Isola Ferdinandea 1831, Campi Flegrei 1528, Ischia 1302, Larderello 1282, Lipari 729, Vulsini 104BC)
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Answers by country

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answers
flagItaly
3%
25%
68%
1%
79
flagGermany
8%
26%
62%
2%
167
flagRepublic of Ireland
9%
30%
54%
3%
33
flagthe Netherlands
14%
24%
53%
6%
49
flagAustria
11%
26%
53%
7%
26
flagFrance
7%
37%
51%
3%
27
flagCanada
15%
32%
47%
5%
53
flagNorway
13%
26%
46%
13%
15
flagRussia
13%
33%
46%
6%
15
flagthe Philippines
8%
33%
45%
12%
24
flagThailand
30%
20%
45%
5%
20
flagGreece
23%
27%
44%
4%
43
flagthe United Kingdom
13%
32%
43%
9%
331
flagAustralia
9%
29%
43%
16%
62
flagUkraine
30%
23%
43%
3%
30
flagSpain
21%
25%
42%
7%
28
flagUnknown
12%
32%
40%
16%
25
flagthe United States
17%
29%
39%
12%
671
flagPoland
20%
34%
37%
7%
19498
flagIndia
9%
37%
34%
17%
116

What is the typical source of pressure buildup inside a volcano?

centrifugal force of Earth rotation
magma convection
boiling of rainwater
degassing of magma

Which continent has the least active volcanoes?

Europe
North America
Africa
Australia

Olympus Mons is the largest known volcano. Where is it?

in Australia
in Indonesia
in Antarctica
on Mars

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

in Porto
in Heraklion
in Naples
in Palermo