横向
1
Cold treeless Arctic plain
4
Low-lying land surrounded by higher ground
5
Goods sold to another country
6
Mountain that can erupt with lava
7
Vast body of salt water
8
City that is seat of government
纵向
1
Region between the two tropic lines
2
Area where water covers the soil
3
Height above sea level
4
Line dividing two countries
9
Largest river in South America
10
Chain or group of islands