横向
1
Ridge of rock or coral near the surface
3
Height above sea level
7
Cold treeless Arctic plain
8
Vast body of salt water
9
Body of water surrounded by land
10
Where river meets the sea
纵向
2
Low area between mountains
4
Largest ocean on Earth
5
Large area covered with trees
6
Narrow sea inlet between cliffs
11
Region surrounding the North Pole
12
Largest hot desert in the world