Across
1
Cold treeless Arctic plain
3
Deep narrow valley with steep sides
4
Largest hot desert in the world
6
Land surrounded by water on three sides
7
Ocean between Americas and Europe/Africa
8
Long-term weather patterns of an area
Down
2
Flat elevated area of land
3
City that is seat of government
5
Largest river in South America
9
One of seven major landmasses