横向
1
Wearing away of land by water or wind
4
Region surrounding the North Pole
6
Flat grassland in tropical regions
7
Ocean between Americas and Europe/Africa
8
Largest hot desert in the world
9
Line dividing two countries
纵向
2
Vast body of salt water
3
Cold treeless Arctic plain
4
Chain or group of islands
5
Region between the two tropic lines
10
Area where water covers the soil