横向
1
Physical features of land
2
Largest ocean on Earth
5
Largest river in South America
6
Height above sea level
7
Where river meets the sea
8
Seasonal heavy rainfall
9
Wearing away of land by water or wind
10
City that is seat of government
纵向
2
Total number of people in an area
3
Landform where river meets the sea
4
Chain or group of islands
11
One of seven major landmasses
12
Ridge of rock or coral near the surface