Across
1
Chain or group of islands
5
Ridge of rock or coral near the surface
7
Steep rock face at edge of land
9
Seasonal heavy rainfall
11
Low area between mountains
Down
1
Largest river in South America
2
Imaginary line around the middle of Earth
3
Half of the Earth
4
Height above sea level
6
Low-lying land surrounded by higher ground
8
Large area covered with trees
10
Deep narrow valley with steep sides