横向
1
Largest ocean on Earth
4
Cold treeless Arctic plain
6
Height above sea level
8
Low-lying land surrounded by higher ground
纵向
2
Large area covered with trees
3
Large slow-moving mass of ice
5
Region surrounding the North Pole
7
Mountain that can erupt with lava
9
Land surrounded by water on three sides
10
Large body of water partly enclosed by land
11
Region between the two tropic lines
12
Landform where river meets the sea