How many main mountain ranges does the United States have?
3
2
2
2
3
2
3
2
3
2
3
4
2
3
4
2
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
1
3
5
4
2
6
1
3
5
4
2
7
6
1
3
5
4
2
7
6
1
3
5
4
7
6
1
3
5
4
7
6
1
3
5
4
7
6
1
5
4
7
6
1
5
4
7
6
1
8
0
5
4
7
6
1
8
5
0
7
6
1
8
5
7
0
6
1
8
7
9
6
8
0
7
9
6
8
0
7
9
6
8
7
9
10
6
8
7
9
10
6
8
7
9
10
6
ten
8
7
9
10
6
8
ten
7
9
10
6
8
ten
7
9
10
6
8
12
7
9
10
ten
8
12
11
9
10
8
ten
12
11
9
10
14
62
8
12
11
9
10
14
8