横向
1
Area where water covers the soil
3
Deep narrow valley with steep sides
4
Largest river in South America
8
Long-term weather patterns of an area
9
Height above sea level
纵向
2
Physical features of land
3
One of seven major landmasses
5
Steep rock face at edge of land
6
Total number of people in an area
7
Largest ocean on Earth
10
Distance north or south of equator
11
Mountain that can erupt with lava