横向
1
Largest ocean on Earth
3
Flat grassland in tropical regions
4
Land surrounded by water on three sides
5
Large body of water partly enclosed by land
7
Flat elevated area of land
8
Region between the two tropic lines
纵向
2
Physical features of land
4
Total number of people in an area
6
Wearing away of land by water or wind
9
Imaginary line around the middle of Earth