横向
1
Dry land with little rainfall
5
Low-lying land surrounded by higher ground
6
Where river meets the sea
7
Flat elevated area of land
9
Deep narrow valley with steep sides
13
Largest river in South America
纵向
2
Height above sea level
3
Piece of land jutting into the sea
4
Landform where river meets the sea
8
One of seven major landmasses
9
Steep rock face at edge of land
10
Flat grassland in tropical regions
11
Half of the Earth
12
Mountain that can erupt with lava