横向
1
Low-lying land surrounded by higher ground
4
Line dividing two countries
5
Deep narrow valley with steep sides
6
Large natural elevation of earth
9
Narrow sea inlet between cliffs
11
Long-term weather patterns of an area
12
Raised area of land, smaller than a mountain
纵向
2
Physical features of land
3
Largest river in South America
5
One of seven major landmasses
7
Large natural stream of water
8
Low area between mountains
10
Wearing away of land by water or wind