横向
1
Total number of people in an area
6
Land surrounded by water on three sides
7
Vast body of salt water
11
Mountain that can erupt with lava
12
Low-lying land surrounded by higher ground
纵向
2
Dry land with little rainfall
3
Large area covered with trees
4
Low area between mountains
5
Region between the two tropic lines
8
Wearing away of land by water or wind
9
Largest ocean on Earth
10
Seasonal heavy rainfall