横向
1
Low area between mountains
4
Largest river in South America
5
City that is seat of government
8
Seasonal heavy rainfall
11
Large slow-moving mass of ice
13
Region surrounding the North Pole
纵向
2
Vast body of salt water
3
Physical features of land
6
Largest ocean on Earth
7
Landform where river meets the sea
9
Deep narrow valley with steep sides
10
Largest hot desert in the world
12
Total number of people in an area