横向
1
Landform where river meets the sea
4
Deep narrow valley with steep sides
6
Flat elevated area of land
7
Largest ocean on Earth
9
Half of the Earth
11
Large natural stream of water
纵向
2
Ridge of rock or coral near the surface
3
Large area covered with trees
5
Largest hot desert in the world
8
Low area between mountains
10
Cold treeless Arctic plain