Across
1
Half of the Earth
6
Deep narrow valley with steep sides
7
Distance east or west of prime meridian
8
Largest hot desert in the world
9
Mountain that can erupt with lava
11
Area where water covers the soil
Down
2
Cold treeless Arctic plain
3
Large slow-moving mass of ice
4
Wearing away of land by water or wind
5
Total number of people in an area
10
Seasonal heavy rainfall