横向
1
Tool for finding directions
5
Landform where river meets the sea
6
Line dividing two countries
7
Wearing away of land by water or wind
8
Total number of people in an area
11
Largest ocean on Earth
纵向
2
Flat elevated area of land
3
Flat grassland in tropical regions
4
Goods brought in from another country
6
Low-lying land surrounded by higher ground
9
Raised area of land, smaller than a mountain
10
Cold treeless Arctic plain
12
Body of water surrounded by land
13
Large natural elevation of earth
14
Largest river in South America