Across
1
Piece of land jutting into the sea
3
Cold treeless Arctic plain
5
Low-lying land surrounded by higher ground
6
One of seven major landmasses
9
Largest river in South America
10
Low area between mountains
Down
2
Largest ocean on Earth
4
Vast body of salt water
5
Line dividing two countries
7
Flat elevated area of land
8
Flat grassland in tropical regions