横向
1
Area where water covers the soil
4
Imaginary line around the middle of Earth
6
Largest ocean on Earth
8
Low-lying land surrounded by higher ground
10
Landform where river meets the sea
纵向
2
Deep narrow valley with steep sides
3
Total number of people in an area
5
Land surrounded by water
7
Piece of land jutting into the sea
9
Physical features of land
11
Low area between mountains
12
Half of the Earth
13
Raised area of land, smaller than a mountain