横向
1
Region surrounding the North Pole
4
Dry land with little rainfall
6
Distance north or south of equator
9
Seasonal heavy rainfall
10
Height above sea level
纵向
2
Low area between mountains
3
Low-lying land surrounded by higher ground
5
Largest ocean on Earth
7
Ridge of rock or coral near the surface
8
Narrow sea inlet between cliffs
11
Cold treeless Arctic plain