Across
1
Ridge of rock or coral near the surface
4
Height above sea level
5
Low area between mountains
6
Area where water covers the soil
8
Narrow sea inlet between cliffs
9
Wearing away of land by water or wind
11
Largest river in South America
Down
2
Chain or group of islands
3
Largest ocean on Earth
7
Large body of water partly enclosed by land
10
Distance east or west of prime meridian