横向
1
Total number of people in an area
5
Largest hot desert in the world
8
One of seven major landmasses
9
Line dividing two countries
10
Flat grassland in tropical regions
纵向
2
Half of the Earth
3
Flat elevated area of land
4
Steep rock face at edge of land
6
Landform where river meets the sea
7
Wearing away of land by water or wind