横向
1
Deep narrow valley with steep sides
4
Dry land with little rainfall
5
Large natural elevation of earth
6
Body of water surrounded by land
8
Flat elevated area of land
11
Largest river in South America
纵向
2
Imaginary line around the middle of Earth
3
Mountain that can erupt with lava
7
Cold treeless Arctic plain
9
Land surrounded by water on three sides
10
Flat grassland in tropical regions