横向
1
Visual representation of an area
3
Wearing away of land by water or wind
5
Flat grassland in tropical regions
7
Large natural elevation of earth
9
Chain or group of islands
10
Large area covered with trees
13
Piece of land jutting into the sea
纵向
2
Distance north or south of equator
4
Largest hot desert in the world
6
Seasonal heavy rainfall
8
Land surrounded by water
11
Low area between mountains
12
Largest ocean on Earth