Across
1
Largest river in South America
5
Wearing away of land by water or wind
6
Flat elevated area of land
7
Raised area of land, smaller than a mountain
8
Dry land with little rainfall
10
One of seven major landmasses
11
Large natural stream of water
12
Imaginary line around the middle of Earth
Down
2
Cold treeless Arctic plain
3
Tool for finding directions
4
Total number of people in an area
5
Where river meets the sea
9
Distance north or south of equator