Across
1
Line dividing two countries
4
Flat elevated area of land
7
Mountain that can erupt with lava
8
Flat grassland in tropical regions
9
Narrow sea inlet between cliffs
10
Half of the Earth
11
Goods brought in from another country
12
Body of water surrounded by land
13
Largest hot desert in the world
Down
2
Largest river in South America
3
Height above sea level
5
Large natural elevation of earth
6
Chain or group of islands