Across
1
Where river meets the sea
4
Largest hot desert in the world
5
Steep rock face at edge of land
7
Large area covered with trees
8
Goods sold to another country
9
Region near the equator
Down
2
Low area between mountains
3
Mountain that can erupt with lava
6
Region surrounding the North Pole
10
Flat grassland in tropical regions
11
Wearing away of land by water or wind
12
Distance east or west of prime meridian