Across
1
Landform where river meets the sea
2
Total number of people in an area
4
Ridge of rock or coral near the surface
5
Cold treeless Arctic plain
13
Goods sold to another country
Down
2
Flat elevated area of land
3
Body of water surrounded by land
6
Half of the Earth
7
Dry land with little rainfall
8
Largest river in South America
9
Steep rock face at edge of land
10
Low area between mountains
11
Flat grassland in tropical regions
12
Mountain that can erupt with lava