Across
1
Area where water covers the soil
5
Total number of people in an area
6
Cold treeless Arctic plain
9
Where river meets the sea
10
Large body of water partly enclosed by land
12
Imaginary line around the middle of Earth
13
Tool for finding directions
Down
2
Large natural stream of water
3
Flat grassland in tropical regions
4
Line dividing two countries
7
Body of water surrounded by land
8
Height above sea level
11
Chain or group of islands
14
Wearing away of land by water or wind
15
Deep narrow valley with steep sides