横向
1
Total number of people in an area
6
Distance north or south of equator
7
Flat grassland in tropical regions
8
Land surrounded by water
9
Where river meets the sea
11
Low area between mountains
纵向
2
Line dividing two countries
3
Seasonal heavy rainfall
4
Landform where river meets the sea
5
Goods sold to another country
10
Goods brought in from another country
12
Region surrounding the North Pole
13
One of seven major landmasses
14
Low-lying land surrounded by higher ground
15
Mountain that can erupt with lava