横向
1
Flat elevated area of land
5
Vast body of salt water
7
Largest river in South America
8
Goods sold to another country
纵向
2
Wearing away of land by water or wind
3
Region between the two tropic lines
4
Imaginary line around the middle of Earth
6
Cold treeless Arctic plain
9
Line dividing two countries
10
Physical features of land