横向
1
Cold treeless Arctic plain
5
Flat elevated area of land
7
Wearing away of land by water or wind
10
Vast body of salt water
纵向
2
Large natural stream of water
3
Height above sea level
4
Large natural elevation of earth
6
Half of the Earth
8
Long-term weather patterns of an area
9
Physical features of land
11
Mountain that can erupt with lava
12
Land surrounded by water on three sides