Across
1
Line dividing two countries
3
Raised area of land, smaller than a mountain
5
Region between the two tropic lines
6
Region near the equator
8
Dry land with little rainfall
9
Imaginary line around the middle of Earth
10
Wearing away of land by water or wind
Down
2
Region surrounding the North Pole
4
Half of the Earth
7
Distance north or south of equator
11
Low-lying land surrounded by higher ground
12
Deep narrow valley with steep sides