Across
1
Area where water covers the soil
4
Largest ocean on Earth
7
Seasonal heavy rainfall
9
Ocean between Americas and Europe/Africa
10
Landform where river meets the sea
11
Large area covered with trees
Down
2
Wearing away of land by water or wind
3
Low area between mountains
5
Flat grassland in tropical regions
6
Height above sea level
8
Largest river in South America
12
Cold treeless Arctic plain
13
Largest hot desert in the world