How many U.S. states have active volcanoes?
12
2
2
3
2
3
1
2
3
1
2
3
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
7
1
2
3
4
5
7
1
2
3
4
5
7
1
2
3
4
5
7
1
2
3
4
5
7
1
2
3
4
6
5
7
1
2
3
4
6
8
5
7
1
2
3
4
6
8
5
7
1
2
3
4
6
8
5
7
1
2
3
4
6
9
8
5
13
7
1
2
3
4
6
9
8
5
13
7
1
3
4
10
6
9
8
5
13
7
1
4
10
6
9
8
5
13
7
11
1
4
10
6
9
8
5
13
7
11
4
10
6
9
8
5
13
7
11
4
10
6
9
12
8
5
13
7
11
10
6
9
14
12
8
13
7
11
10
6
9
14
12
8
13
7
11
10
6
9
14
12
8
13
7
11
10
6
4 states
9
14
12
8
13
7
11
10
6