横向
1
Area where water covers the soil
4
Physical features of land
5
Long-term weather patterns of an area
7
Dry land with little rainfall
8
Deep narrow valley with steep sides
9
Ridge of rock or coral near the surface
10
Mountain that can erupt with lava
纵向
2
Large natural elevation of earth
3
Region surrounding the North Pole
4
Cold treeless Arctic plain
6
Flat grassland in tropical regions