Across
1
Largest river in South America
5
Mountain that can erupt with lava
6
Area where water covers the soil
10
Piece of land jutting into the sea
11
Largest hot desert in the world
Down
2
Total number of people in an area
3
Wearing away of land by water or wind
4
Low-lying land surrounded by higher ground
7
Region surrounding the North Pole
8
Height above sea level
9
Body of water surrounded by land