Across
1
Imaginary line around the middle of Earth
5
Half of the Earth
6
Total number of people in an area
7
Large area covered with trees
10
Cold treeless Arctic plain
Down
2
Flat elevated area of land
3
Large body of water partly enclosed by land
4
Wearing away of land by water or wind
8
Deep narrow valley with steep sides
9
Region between the two tropic lines
11
Body of water surrounded by land