横向
1
Low-lying land surrounded by higher ground
3
Largest hot desert in the world
4
Region surrounding the North Pole
6
Vast body of salt water
8
City that is seat of government
纵向
2
Land surrounded by water
3
Flat grassland in tropical regions
5
Wearing away of land by water or wind
7
Where river meets the sea
9
Flat elevated area of land
10
Body of water surrounded by land