Across
1
Height above sea level
2
Largest ocean on Earth
4
Raised area of land, smaller than a mountain
5
Low-lying land surrounded by higher ground
9
Distance east or west of prime meridian
Down
2
Total number of people in an area
3
Cold treeless Arctic plain
5
Line dividing two countries
6
Where river meets the sea
7
Physical features of land
8
Half of the Earth
10
Flat elevated area of land
11
Distance north or south of equator
12
Ridge of rock or coral near the surface