How many active volcanoes are there in the U.S.?
5
3
4
5
3
4
2
5
3
4
2
5
3
4
2
5
3
4
2
5
3
4
2
5
1
3
4
2
5
1
3
4
2
5
1
3
4
2
5
1
3
4
2
5
1
6
3
4
2
5
7
1
6
3
4
2
5
7
1
6
3
4
2
5
0
7
1
6
3
4
2
5
7
1
6
3
4
2
5
7
1
6
3
4
2
5
7
1
6
3
9
4
2
5
8
7
1
6
3
9
4
2
5
8
7
1
6
3
9
4
2
5
8
7
1
6
3
9
4
2
5
8
7
1
6
9
2
11
8
7
1
6
9
11
8
10
7
1
6
9
11
13
8
10
7
1
6
9
11
13
8
10
7
1
6
9
11
13
12
8
10
7
1
6
9
11
13
12
8
10
7
6
9
11
13
12
8
10
7
6
9
11
13
12
8
10
7
6
9
11
13
12
14
66
59
62
63
57
132
58
61