横向
1
Low-lying land surrounded by higher ground
3
Region surrounding the North Pole
4
Long-term weather patterns of an area
5
Area where water covers the soil
6
Cold treeless Arctic plain
纵向
2
City that is seat of government
3
Ocean between Americas and Europe/Africa
7
Region near the equator
8
Flat grassland in tropical regions
9
Total number of people in an area
10
Deep narrow valley with steep sides
11
Mountain that can erupt with lava