Across
1
Low-lying land surrounded by higher ground
4
Largest hot desert in the world
5
Landform where river meets the sea
6
Long-term weather patterns of an area
7
Imaginary line around the middle of Earth
10
Mountain that can erupt with lava
12
Flat grassland in tropical regions
13
Goods sold to another country
Down
2
Largest river in South America
3
Area where water covers the soil
7
Wearing away of land by water or wind
8
Large area covered with trees
9
Vast body of salt water
11
Region between the two tropic lines