Across
1
Cold treeless Arctic plain
3
Flat grassland in tropical regions
4
Body of water surrounded by land
7
Raised area of land, smaller than a mountain
10
Wearing away of land by water or wind
Down
2
Line dividing two countries
3
Largest hot desert in the world
5
Piece of land jutting into the sea
6
Area where water covers the soil
8
Height above sea level
9
Distance east or west of prime meridian