Across
1
Low-lying land surrounded by higher ground
3
Large area covered with trees
5
Chain or group of islands
8
Low area between mountains
9
Piece of land jutting into the sea
11
Flat elevated area of land
12
Steep rock face at edge of land
Down
2
Region surrounding the North Pole
4
Raised area of land, smaller than a mountain
5
Largest river in South America
6
Area where water covers the soil
7
Distance east or west of prime meridian
8
Mountain that can erupt with lava
10
Land surrounded by water
13
Half of the Earth