Across
1
Dry land with little rainfall
5
Where river meets the sea
6
Large area covered with trees
7
Deep narrow valley with steep sides
8
Goods brought in from another country
9
Largest river in South America
Down
2
Height above sea level
3
Region near the equator
4
Wearing away of land by water or wind
10
Low area between mountains
11
Largest ocean on Earth
12
Total number of people in an area
13
Largest hot desert in the world