Across
1
Height above sea level
2
Low-lying land surrounded by higher ground
6
Region surrounding the North Pole
7
Long-term weather patterns of an area
9
Large body of water partly enclosed by land
10
Ridge of rock or coral near the surface
13
Narrow sea inlet between cliffs
Down
2
Line dividing two countries
3
Goods sold to another country
4
Largest ocean on Earth
5
Where river meets the sea
8
Imaginary line around the middle of Earth
11
Half of the Earth
12
Large area covered with trees