Across
1
Cold treeless Arctic plain
5
Wearing away of land by water or wind
6
Low area between mountains
8
Flat grassland in tropical regions
9
Line dividing two countries
10
Land surrounded by water on three sides
11
Half of the Earth
Down
2
Long-term weather patterns of an area
3
City that is seat of government
4
Vast body of salt water
5
Where river meets the sea
7
Dry land with little rainfall