Across
1
Distance east or west of prime meridian
3
Region surrounding the North Pole
6
Wearing away of land by water or wind
7
Land surrounded by water on three sides
9
Low-lying land surrounded by higher ground
10
Large area covered with trees
Down
1
Body of water surrounded by land
2
Half of the Earth
4
Distance north or south of equator
5
Mountain that can erupt with lava
8
Deep narrow valley with steep sides