Across
1
Low area between mountains
3
Flat grassland in tropical regions
5
Ridge of rock or coral near the surface
6
Steep rock face at edge of land
7
Imaginary line around the middle of Earth
8
One of seven major landmasses
11
Large area covered with trees
12
Land surrounded by water
Down
2
Chain or group of islands
4
Half of the Earth
9
Vast body of salt water
10
Narrow sea inlet between cliffs
13
Largest river in South America