Across
1
Low area between mountains
4
Flat grassland in tropical regions
5
Area where water covers the soil
7
Large natural stream of water
9
Goods sold to another country
10
Height above sea level
Down
2
Flat elevated area of land
3
Long-term weather patterns of an area
6
Land surrounded by water
8
Region between the two tropic lines
9
Imaginary line around the middle of Earth
11
Large slow-moving mass of ice
12
Largest river in South America