横向
1
Ocean between Americas and Europe/Africa
6
Half of the Earth
7
Low-lying land surrounded by higher ground
8
Flat grassland in tropical regions
9
Large natural elevation of earth
10
Dry land with little rainfall
纵向
2
Physical features of land
3
Visual representation of an area
4
Cold treeless Arctic plain
5
Region surrounding the North Pole
11
Body of water surrounded by land
12
Distance north or south of equator
13
Deep narrow valley with steep sides