横向
1
Large natural elevation of earth
3
Landform where river meets the sea
5
Large natural stream of water
9
Body of water surrounded by land
10
Largest river in South America
12
Low-lying land surrounded by higher ground
13
Region surrounding the North Pole
14
Vast body of salt water
15
Land surrounded by water
纵向
2
Low area between mountains
4
Wearing away of land by water or wind
6
Deep narrow valley with steep sides
7
Large slow-moving mass of ice
8
Height above sea level
11
Imaginary line around the middle of Earth