How many continents were discovered on Earth?
7
5
5
5
4
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
6
3
5
4
6
3
5
4
7
6
3
5
4
7
6
3
5
4
1
7
6
3
5
4
1
7
6
3
5
2
4
1
7
6
3
5
2
4
1
7
6
3
5
2
4
1
7
6
3
5
2
4
1
7
6
3
5
2
9
4
1
7
6
8
3
5
2
9
4
1
7
10
6
8
3
5
2
9
4
1
7
10
6
8
3
2
9
4
1
11
7
10
6
8
12
3
2
9
4
1
11
7
10
6
8
12
3
2
9
1
11
7
10
6
8
12
2
9
1
11
7
10
6
8
12
2
13
9
1
11
7
10
6
8
12
2
13
9
1
11
7
10
6
8
12
2
13
9
1
11
14
7
10
6
8
12
2
13
9
1
11
14
7
10
8
12
2
13
9
1
11
14
7
10
8
12
13
1 continent
112
128
128