横向
1
Cold treeless Arctic plain
4
Largest ocean on Earth
6
Land surrounded by water
8
Low area between mountains
11
Steep rock face at edge of land
纵向
1
Physical features of land
2
Wearing away of land by water or wind
3
Large area covered with trees
5
Raised area of land, smaller than a mountain
7
Flat grassland in tropical regions
9
Ocean between Americas and Europe/Africa
10
Large body of water partly enclosed by land