横向
1
Total number of people in an area
5
Landform where river meets the sea
6
Largest hot desert in the world
7
Region near the equator
10
Largest river in South America
11
Large natural elevation of earth
纵向
2
Flat grassland in tropical regions
3
Goods brought in from another country
4
Vast body of salt water
5
Dry land with little rainfall
8
Deep narrow valley with steep sides
9
Raised area of land, smaller than a mountain