横向
1
Wearing away of land by water or wind
5
Large natural stream of water
7
Largest river in South America
8
Vast body of salt water
9
Body of water surrounded by land
10
Piece of land jutting into the sea
11
Ocean between Americas and Europe/Africa
纵向
2
Total number of people in an area
3
Region surrounding the North Pole
4
Ridge of rock or coral near the surface
6
Cold treeless Arctic plain
12
Land surrounded by water
13
Chain or group of islands