How many deserts in the world have an area of more than 3 million square miles?
3
1
1
1
1
2
1
2
1
2
3
1
2
3
1
4
2
3
1
4
2
3
1
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
2
3
1
5
4
6
2
3
0
1
5
4
6
2
3
1
5
4
6
2
3
7
5
4
6
2
3
7
5
4
6
2
3
7
5
4
6
2
3
7
5
4
6
3
7
5
4
6
3
7
8
5
4
6
7
8
5
4
6
7
8
5
6
9
7
8
5
6
10
9
7
8
5
6
10
9
7
8
6
10
9
11
7
8
6
10
9
11
7
8
6
10
9
11
7
8
6
10
9
12
11
7
13
8
6
10
9
12
11
7
13
8
6
10
9
12
11
7
13
8
6
10
9
12
11
7
13
8
10
9
12
11
7
13
8
128
128
128
1 desert
128
66
128