横向
1
Largest hot desert in the world
4
Distance north or south of equator
5
Total number of people in an area
8
Deep narrow valley with steep sides
12
Height above sea level
13
Piece of land jutting into the sea
纵向
2
Low area between mountains
3
Region near the equator
6
Largest river in South America
7
Wearing away of land by water or wind
9
Cold treeless Arctic plain
10
Flat elevated area of land
11
Vast body of salt water