横向
1
Deep narrow valley with steep sides
3
Landform where river meets the sea
5
Imaginary line around the middle of Earth
6
Largest river in South America
7
Ridge of rock or coral near the surface
8
Steep rock face at edge of land
9
Large area covered with trees
纵向
1
One of seven major landmasses
2
Cold treeless Arctic plain
4
Land surrounded by water on three sides