Across
1
Goods sold to another country
4
Wearing away of land by water or wind
8
Low-lying land surrounded by higher ground
10
City that is seat of government
11
Cold treeless Arctic plain
Down
2
Deep narrow valley with steep sides
3
Physical features of land
5
Goods brought in from another country
6
Distance north or south of equator
7
Largest river in South America
9
Distance east or west of prime meridian