Across
1
Deep narrow valley with steep sides
4
Steep rock face at edge of land
5
Line dividing two countries
6
Land surrounded by water
8
Wearing away of land by water or wind
9
Distance east or west of prime meridian
12
Largest river in South America
13
Visual representation of an area
Down
2
Height above sea level
3
Land surrounded by water on three sides
7
Large natural elevation of earth
10
Narrow sea inlet between cliffs
11
Large slow-moving mass of ice