Across
1
Total number of people in an area
4
Steep rock face at edge of land
7
Cold treeless Arctic plain
9
Where river meets the sea
10
Largest ocean on Earth
12
Height above sea level
14
Largest river in South America
15
Vast body of salt water
Down
2
Body of water surrounded by land
3
Land surrounded by water
5
Line dividing two countries
6
Goods sold to another country
8
Low-lying land surrounded by higher ground
11
Raised area of land, smaller than a mountain
13
Land surrounded by water on three sides