Across
1
Total number of people in an area
6
Land surrounded by water
7
Large natural stream of water
8
Where river meets the sea
9
Large area covered with trees
10
Region surrounding the North Pole
11
Long-term weather patterns of an area
Down
2
Large slow-moving mass of ice
3
Largest river in South America
4
Flat grassland in tropical regions
5
Region between the two tropic lines
7
Ridge of rock or coral near the surface