横向
1
Imaginary line around the middle of Earth
5
Deep narrow valley with steep sides
6
Landform where river meets the sea
9
One of seven major landmasses
纵向
2
Large area covered with trees
3
Region surrounding the North Pole
4
Tool for finding directions
7
Seasonal heavy rainfall
8
Wearing away of land by water or wind
10
Ridge of rock or coral near the surface