Across
1
Half of the Earth
5
Low-lying land surrounded by higher ground
7
City that is seat of government
8
Long-term weather patterns of an area
9
Cold treeless Arctic plain
10
Large natural elevation of earth
11
Mountain that can erupt with lava
Down
2
Height above sea level
3
Vast body of salt water
4
Where river meets the sea
6
Ridge of rock or coral near the surface
9
Physical features of land