横向
1
Area where water covers the soil
3
Goods brought in from another country
4
Deep narrow valley with steep sides
7
Cold treeless Arctic plain
纵向
2
Ocean between Americas and Europe/Africa
4
One of seven major landmasses
5
Narrow sea inlet between cliffs
6
Raised area of land, smaller than a mountain
8
Total number of people in an area
9
Flat grassland in tropical regions