横向
1
Wearing away of land by water or wind
3
Landform where river meets the sea
5
Large natural stream of water
7
Imaginary line around the middle of Earth
9
Flat grassland in tropical regions
10
Physical features of land
11
Ocean between Americas and Europe/Africa
纵向
2
Chain or group of islands
4
Dry land with little rainfall
6
Land surrounded by water
8
Where river meets the sea
12
Region between the two tropic lines
13
Long-term weather patterns of an area