Across
1
Wearing away of land by water or wind
3
Large area covered with trees
4
Cold treeless Arctic plain
5
Flat grassland in tropical regions
8
Raised area of land, smaller than a mountain
9
One of seven major landmasses
10
Visual representation of an area
11
Height above sea level
12
Deep narrow valley with steep sides
Down
2
Largest river in South America
3
Narrow sea inlet between cliffs
6
Chain or group of islands
7
Land surrounded by water