横向
1
Landform where river meets the sea
3
Steep rock face at edge of land
5
Low area between mountains
8
Large natural stream of water
9
Large natural elevation of earth
12
Deep narrow valley with steep sides
纵向
2
Ocean between Americas and Europe/Africa
4
Flat grassland in tropical regions
6
Imaginary line around the middle of Earth
7
Region surrounding the North Pole
10
Narrow sea inlet between cliffs
11
Wearing away of land by water or wind