Across
1
Seasonal heavy rainfall
3
Region surrounding the North Pole
4
Height above sea level
10
Distance east or west of prime meridian
12
Line dividing two countries
13
Piece of land jutting into the sea
Down
2
Wearing away of land by water or wind
5
Deep narrow valley with steep sides
6
Large slow-moving mass of ice
7
Total number of people in an area
8
Largest ocean on Earth
9
Vast body of salt water
11
Flat elevated area of land