Across
1
Goods brought in from another country
4
Deep narrow valley with steep sides
6
Raised area of land, smaller than a mountain
8
Cold treeless Arctic plain
Down
2
Low-lying land surrounded by higher ground
3
Seasonal heavy rainfall
4
Steep rock face at edge of land
5
Low area between mountains
7
Large natural elevation of earth
9
Where river meets the sea
10
Largest ocean on Earth