Across
1
Line dividing two countries
4
Total number of people in an area
5
Cold treeless Arctic plain
6
Low area between mountains
11
Deep narrow valley with steep sides
13
Large area covered with trees
Down
1
Low-lying land surrounded by higher ground
2
Goods sold to another country
3
Ridge of rock or coral near the surface
7
Distance east or west of prime meridian
8
Area where water covers the soil
9
Flat elevated area of land
10
Region surrounding the North Pole
12
Raised area of land, smaller than a mountain