横向
1
Land surrounded by water on three sides
6
Line dividing two countries
7
Largest ocean on Earth
8
Largest river in South America
9
Raised area of land, smaller than a mountain
10
Cold treeless Arctic plain
11
Seasonal heavy rainfall
纵向
2
Imaginary line around the middle of Earth
3
Ocean between Americas and Europe/Africa
4
Long-term weather patterns of an area
5
Dry land with little rainfall
12
Flat grassland in tropical regions