Across
1
Half of the Earth
3
Total number of people in an area
5
Land surrounded by water
7
Raised area of land, smaller than a mountain
8
Long-term weather patterns of an area
10
Region between the two tropic lines
11
Deep narrow valley with steep sides
Down
2
Largest river in South America
3
Land surrounded by water on three sides
4
Area where water covers the soil
6
Imaginary line around the middle of Earth
9
Wearing away of land by water or wind
12
Distance north or south of equator