横向
1
Region between the two tropic lines
2
Wearing away of land by water or wind
4
Ocean between Americas and Europe/Africa
5
Largest ocean on Earth
7
Line dividing two countries
9
Imaginary line around the middle of Earth
10
Flat grassland in tropical regions
12
Region surrounding the North Pole
13
Seasonal heavy rainfall
纵向
2
Goods sold to another country
3
Raised area of land, smaller than a mountain
6
Cold treeless Arctic plain
8
Total number of people in an area
11
Physical features of land