Across
1
Total number of people in an area
4
Dry land with little rainfall
7
Large area covered with trees
8
Large natural stream of water
9
Imaginary line around the middle of Earth
10
Wearing away of land by water or wind
13
Largest river in South America
Down
2
Half of the Earth
3
One of seven major landmasses
5
Goods sold to another country
6
Area where water covers the soil
11
Mountain that can erupt with lava
12
Body of water surrounded by land