横向
1
Wearing away of land by water or wind
5
Land surrounded by water
7
Half of the Earth
8
Large natural stream of water
9
Height above sea level
10
City that is seat of government
12
Cold treeless Arctic plain
纵向
2
Dry land with little rainfall
3
Largest ocean on Earth
4
Land surrounded by water on three sides
6
Chain or group of islands
11
Total number of people in an area