Across
1
Cold treeless Arctic plain
3
Imaginary line around the middle of Earth
5
Half of the Earth
9
Raised area of land, smaller than a mountain
11
Narrow sea inlet between cliffs
12
Dry land with little rainfall
13
Line dividing two countries
Down
2
Distance north or south of equator
3
Goods sold to another country
4
Flat grassland in tropical regions
6
Largest river in South America
7
One of seven major landmasses
8
Ridge of rock or coral near the surface
10
Large natural stream of water