Across
1
Distance east or west of prime meridian
4
Region surrounding the North Pole
6
Mountain that can erupt with lava
9
Deep narrow valley with steep sides
10
Wearing away of land by water or wind
Down
2
Total number of people in an area
3
Steep rock face at edge of land
5
Cold treeless Arctic plain
7
Vast body of salt water
8
Body of water surrounded by land