Across
1
Piece of land jutting into the sea
3
Ridge of rock or coral near the surface
4
Low area between mountains
8
Total number of people in an area
9
Largest river in South America
10
Where river meets the sea
11
Large slow-moving mass of ice
Down
1
Steep rock face at edge of land
2
Imaginary line around the middle of Earth
5
Height above sea level
6
Deep narrow valley with steep sides
7
Ocean between Americas and Europe/Africa
8
Land surrounded by water on three sides
12
Flat grassland in tropical regions
13
Wearing away of land by water or wind