Across
1
Mountain that can erupt with lava
4
Total number of people in an area
5
Land surrounded by water
7
Low-lying land surrounded by higher ground
8
Flat grassland in tropical regions
10
Imaginary line around the middle of Earth
Down
2
Narrow sea inlet between cliffs
3
Piece of land jutting into the sea
4
Land surrounded by water on three sides
6
Line dividing two countries
9
Where river meets the sea
11
Flat elevated area of land
12
Largest river in South America