Across
1
Low-lying land surrounded by higher ground
2
Cold treeless Arctic plain
4
Large slow-moving mass of ice
5
Chain or group of islands
8
Visual representation of an area
9
Area where water covers the soil
12
Large area covered with trees
Down
2
Region near the equator
3
Flat grassland in tropical regions
6
Height above sea level
7
Mountain that can erupt with lava
10
One of seven major landmasses
11
Largest river in South America
13
Distance east or west of prime meridian