Across
1
Low-lying land surrounded by higher ground
4
Large natural elevation of earth
5
Largest river in South America
7
Low area between mountains
9
Region surrounding the North Pole
11
Mountain that can erupt with lava
13
Area where water covers the soil
Down
2
Where river meets the sea
3
Ocean between Americas and Europe/Africa
4
Seasonal heavy rainfall
6
Deep narrow valley with steep sides
8
Piece of land jutting into the sea
10
Body of water surrounded by land
12
Land surrounded by water