Across
1
Total number of people in an area
4
Body of water surrounded by land
7
Landform where river meets the sea
8
Low area between mountains
10
Chain or group of islands
11
Seasonal heavy rainfall
Down
2
Imaginary line around the middle of Earth
3
Largest river in South America
5
Large body of water partly enclosed by land
6
Largest ocean on Earth
9
Line dividing two countries
12
Mountain that can erupt with lava
13
Distance north or south of equator