横向
1
Low area between mountains
3
Large natural elevation of earth
4
Region near the equator
6
Cold treeless Arctic plain
7
Flat grassland in tropical regions
10
Vast body of salt water
11
Goods sold to another country
纵向
2
Height above sea level
5
Half of the Earth
8
Seasonal heavy rainfall
9
Piece of land jutting into the sea
12
Physical features of land