横向
1
Landform where river meets the sea
4
Low-lying land surrounded by higher ground
5
Total number of people in an area
7
Ridge of rock or coral near the surface
8
Flat elevated area of land
纵向
1
Dry land with little rainfall
2
Land surrounded by water
3
Cold treeless Arctic plain
6
Largest river in South America
9
Large slow-moving mass of ice