横向
1
Wearing away of land by water or wind
5
Where river meets the sea
6
Tool for finding directions
7
Chain or group of islands
9
Goods brought in from another country
12
Dry land with little rainfall
纵向
2
Large area covered with trees
3
Region surrounding the North Pole
4
Region between the two tropic lines
8
Seasonal heavy rainfall
10
Large natural elevation of earth
11
Landform where river meets the sea
13
Flat grassland in tropical regions