Across
1
Imaginary line around the middle of Earth
4
Region near the equator
5
Total number of people in an area
6
Flat elevated area of land
10
Flat grassland in tropical regions
11
Land surrounded by water
13
Cold treeless Arctic plain
Down
2
Largest ocean on Earth
3
Deep narrow valley with steep sides
7
Large slow-moving mass of ice
8
Long-term weather patterns of an area
9
Distance north or south of equator
12
Where river meets the sea