Across
1
Total number of people in an area
6
Height above sea level
7
Body of water surrounded by land
10
Line dividing two countries
Down
2
Distance east or west of prime meridian
3
Imaginary line around the middle of Earth
4
Low-lying land surrounded by higher ground
5
Largest river in South America
8
Raised area of land, smaller than a mountain
9
Vast body of salt water