横向
1
Total number of people in an area
7
Largest river in South America
8
Dry land with little rainfall
11
Distance north or south of equator
纵向
2
Goods sold to another country
3
Land surrounded by water
4
Goods brought in from another country
5
Long-term weather patterns of an area
6
Flat grassland in tropical regions
9
Large natural stream of water
10
Narrow sea inlet between cliffs
12
Distance east or west of prime meridian
13
Mountain that can erupt with lava