Across
1
Large natural stream of water
3
Large body of water partly enclosed by land
4
Low-lying land surrounded by higher ground
8
Height above sea level
9
Largest ocean on Earth
10
Cold treeless Arctic plain
12
Distance north or south of equator
Down
2
Land surrounded by water
5
Where river meets the sea
6
Line dividing two countries
7
Flat grassland in tropical regions
11
Large natural elevation of earth