Across
1
Imaginary line around the middle of Earth
5
Area where water covers the soil
6
Flat grassland in tropical regions
7
Total number of people in an area
8
Low area between mountains
9
Land surrounded by water on three sides
Down
2
Deep narrow valley with steep sides
3
Narrow sea inlet between cliffs
4
Distance north or south of equator
10
Low-lying land surrounded by higher ground
11
Long-term weather patterns of an area
12
Half of the Earth