横向
1
Largest ocean on Earth
5
Where river meets the sea
6
Imaginary line around the middle of Earth
8
Large natural elevation of earth
纵向
2
Cold treeless Arctic plain
3
Mountain that can erupt with lava
4
Large body of water partly enclosed by land
7
Visual representation of an area
9
Landform where river meets the sea
10
Deep narrow valley with steep sides
11
Flat grassland in tropical regions