Across
1
Low-lying land surrounded by higher ground
3
Piece of land jutting into the sea
5
Wearing away of land by water or wind
7
Flat elevated area of land
10
Distance east or west of prime meridian
Down
2
Largest ocean on Earth
4
Vast body of salt water
6
Low area between mountains
8
Largest river in South America
9
Area where water covers the soil
11
Distance north or south of equator
12
Large slow-moving mass of ice
13
Half of the Earth