横向
1
Large natural elevation of earth
5
Body of water surrounded by land
7
Flat grassland in tropical regions
8
Deep narrow valley with steep sides
9
Steep rock face at edge of land
11
Wearing away of land by water or wind
纵向
2
Height above sea level
3
Dry land with little rainfall
4
Region surrounding the North Pole
6
Vast body of salt water
10
Region near the equator
12
Cold treeless Arctic plain
13
City that is seat of government