横向
1
Steep rock face at edge of land
3
Wearing away of land by water or wind
4
Flat grassland in tropical regions
9
Mountain that can erupt with lava
纵向
2
Land surrounded by water on three sides
5
Largest ocean on Earth
6
Imaginary line around the middle of Earth
7
Raised area of land, smaller than a mountain
8
Cold treeless Arctic plain