横向
1
Ocean between Americas and Europe/Africa
5
Cold treeless Arctic plain
6
Region surrounding the North Pole
7
Where river meets the sea
11
Chain or group of islands
12
Tool for finding directions
纵向
2
Largest hot desert in the world
3
Large natural stream of water
4
Low-lying land surrounded by higher ground
8
Total number of people in an area
9
Large natural elevation of earth
10
Physical features of land
13
Goods sold to another country