横向
1
Dry land with little rainfall
3
Steep rock face at edge of land
5
Mountain that can erupt with lava
8
Flat grassland in tropical regions
10
Largest river in South America
11
Wearing away of land by water or wind
12
Vast body of salt water
纵向
2
Region surrounding the North Pole
3
Piece of land jutting into the sea
4
Narrow sea inlet between cliffs
6
Imaginary line around the middle of Earth
7
Ocean between Americas and Europe/Africa
9
Height above sea level