Across
1
Ridge of rock or coral near the surface
4
Tool for finding directions
5
Steep rock face at edge of land
6
Goods brought in from another country
7
Body of water surrounded by land
10
Flat grassland in tropical regions
12
Wearing away of land by water or wind
13
Line dividing two countries
Down
2
Largest ocean on Earth
3
Where river meets the sea
8
Distance north or south of equator
9
Low-lying land surrounded by higher ground
11
Cold treeless Arctic plain