横向
1
Wearing away of land by water or wind
5
Imaginary line around the middle of Earth
7
Low-lying land surrounded by higher ground
8
Long-term weather patterns of an area
9
Region surrounding the North Pole
纵向
2
Area where water covers the soil
3
Chain or group of islands
4
Physical features of land
6
Seasonal heavy rainfall
10
Large natural stream of water