Across
1
Cold treeless Arctic plain
5
Large area covered with trees
7
Total number of people in an area
8
Flat grassland in tropical regions
9
Ridge of rock or coral near the surface
10
Land surrounded by water
Down
2
Ocean between Americas and Europe/Africa
3
Vast body of salt water
4
Area where water covers the soil
6
Large natural stream of water
11
Low-lying land surrounded by higher ground