Across
1
Raised area of land, smaller than a mountain
4
Line dividing two countries
5
Body of water surrounded by land
6
Largest river in South America
8
Imaginary line around the middle of Earth
9
Land surrounded by water on three sides
10
Height above sea level
Down
2
Wearing away of land by water or wind
3
Chain or group of islands
7
Low-lying land surrounded by higher ground