Across
1
Largest river in South America
5
Low area between mountains
6
Body of water surrounded by land
7
Region surrounding the North Pole
9
Wearing away of land by water or wind
10
One of seven major landmasses
12
Vast body of salt water
Down
2
Flat grassland in tropical regions
3
Largest ocean on Earth
4
Ocean between Americas and Europe/Africa
8
Goods sold to another country
11
Narrow sea inlet between cliffs