Across
1
Large natural stream of water
3
Flat grassland in tropical regions
8
Low-lying land surrounded by higher ground
9
Mountain that can erupt with lava
10
Raised area of land, smaller than a mountain
11
City that is seat of government
12
Flat elevated area of land
Down
2
Landform where river meets the sea
4
Cold treeless Arctic plain
5
Region surrounding the North Pole
6
Deep narrow valley with steep sides
7
Large natural elevation of earth
10
Half of the Earth