How many continents were discovered on Earth?
7
5
5
5
5
5
5
5
4
5
4
5
4
5
4
5
7
4
3
5
2
7
4
3
5
8
2
7
4
3
5
8
2
7
4
3
5
8
2
7
4
3
5
8
2
7
6
4
3
5
8
2
7
6
4
3
5
8
2
7
6
4
3
5
8
2
7
6
4
9
3
5
8
2
7
6
4
9
3
8
2
7
6
4
9
3
8
2
7
6
4
9
3
8
2
7
6
4
9
3
0
8
2
7
6
4
9
3
8
2
0
ten
7
6
4
9
3
8
2
7
6
4
0
ten
9
1
3
8
2
7
6
9
1
3
0
ten
8
14
2
7
6
9
1
3
8
14
2
0
ten
7
6
9
1
3
8
14
2
7
6
0
ten
9
1
3
8
14
2
6
9
1
0
ten
8
14
6
9
1
14
ten
6
9
1
14
13
6
9
1
14
13
6
9
1
78
66
11
14
13
9
1
11
78