横向
1
Ocean between Americas and Europe/Africa
5
Land surrounded by water on three sides
6
Wearing away of land by water or wind
7
Low-lying land surrounded by higher ground
9
Distance north or south of equator
12
Deep narrow valley with steep sides
纵向
2
Large natural elevation of earth
3
Cold treeless Arctic plain
4
Long-term weather patterns of an area
8
Region surrounding the North Pole
10
Dry land with little rainfall
11
Area where water covers the soil