Across
1
Cold treeless Arctic plain
5
Flat grassland in tropical regions
6
Largest hot desert in the world
8
Distance north or south of equator
9
Ridge of rock or coral near the surface
Down
2
Mountain that can erupt with lava
3
Piece of land jutting into the sea
4
Where river meets the sea
7
Region surrounding the North Pole
10
Vast body of salt water