横向
1
Wearing away of land by water or wind
3
Large body of water partly enclosed by land
6
Largest ocean on Earth
8
Ocean between Americas and Europe/Africa
13
Low-lying land surrounded by higher ground
纵向
2
Chain or group of islands
4
Largest river in South America
5
Raised area of land, smaller than a mountain
7
Seasonal heavy rainfall
9
Large area covered with trees
10
Large natural stream of water
11
Body of water surrounded by land
12
Where river meets the sea