Across
1
Imaginary line around the middle of Earth
6
Largest river in South America
9
Cold treeless Arctic plain
Down
2
Flat elevated area of land
3
Total number of people in an area
4
Where river meets the sea
5
Ridge of rock or coral near the surface
7
Large natural elevation of earth
8
Body of water surrounded by land
10
Large body of water partly enclosed by land