横向
1
Wearing away of land by water or wind
4
Landform where river meets the sea
8
Land surrounded by water on three sides
9
Land surrounded by water
11
Line dividing two countries
13
City that is seat of government
14
Goods sold to another country
纵向
2
Largest river in South America
3
Large area covered with trees
5
Low-lying land surrounded by higher ground
6
Total number of people in an area
7
Distance east or west of prime meridian
10
Region surrounding the North Pole
12
Flat elevated area of land
15
Low area between mountains