横向
1
Deep narrow valley with steep sides
3
Ridge of rock or coral near the surface
6
Visual representation of an area
7
Low-lying land surrounded by higher ground
8
Large natural elevation of earth
10
Long-term weather patterns of an area
纵向
2
Distance north or south of equator
4
Vast body of salt water
5
Largest river in South America
9
Wearing away of land by water or wind
11
Seasonal heavy rainfall
12
Area where water covers the soil