Across
1
Where river meets the sea
2
Seasonal heavy rainfall
5
Region surrounding the North Pole
6
Total number of people in an area
10
Imaginary line around the middle of Earth
11
Land surrounded by water
Down
2
Large natural elevation of earth
3
Largest ocean on Earth
4
Region between the two tropic lines
7
Wearing away of land by water or wind
8
Line dividing two countries
9
Flat grassland in tropical regions
12
Raised area of land, smaller than a mountain