Across
1
Low-lying land surrounded by higher ground
4
Large natural stream of water
5
Region surrounding the North Pole
6
Largest river in South America
9
Ocean between Americas and Europe/Africa
11
Large area covered with trees
Down
2
Physical features of land
3
City that is seat of government
7
Half of the Earth
8
Landform where river meets the sea
10
Body of water surrounded by land
12
Deep narrow valley with steep sides