横向
1
Land surrounded by water
5
Cold treeless Arctic plain
6
Low area between mountains
8
Largest river in South America
纵向
2
Landform where river meets the sea
3
Wearing away of land by water or wind
4
Low-lying land surrounded by higher ground
5
Region near the equator
7
Large body of water partly enclosed by land
9
Flat grassland in tropical regions
10
Total number of people in an area