横向
1
Total number of people in an area
5
Wearing away of land by water or wind
8
Large body of water partly enclosed by land
11
One of seven major landmasses
12
Where river meets the sea
纵向
2
Mountain that can erupt with lava
3
Narrow sea inlet between cliffs
4
Deep narrow valley with steep sides
6
Line dividing two countries
7
Flat elevated area of land
9
Long-term weather patterns of an area
10
Region between the two tropic lines
13
Vast body of salt water