横向
1
Deep narrow valley with steep sides
3
Half of the Earth
5
Landform where river meets the sea
7
Total number of people in an area
8
Mountain that can erupt with lava
10
Land surrounded by water on three sides
纵向
2
Land surrounded by water
4
Wearing away of land by water or wind
6
One of seven major landmasses
9
Height above sea level