Across
1
Line dividing two countries
3
Low-lying land surrounded by higher ground
4
Long-term weather patterns of an area
8
Tool for finding directions
9
Largest ocean on Earth
12
Largest hot desert in the world
Down
2
Imaginary line around the middle of Earth
5
Raised area of land, smaller than a mountain
6
Half of the Earth
7
Region between the two tropic lines
10
Largest river in South America
11
Steep rock face at edge of land