Across
1
Mountain that can erupt with lava
5
Ocean between Americas and Europe/Africa
6
Land surrounded by water
7
Large natural stream of water
8
Total number of people in an area
9
Cold treeless Arctic plain
Down
2
Imaginary line around the middle of Earth
3
Large natural elevation of earth
4
Wearing away of land by water or wind
10
Region between the two tropic lines
11
Landform where river meets the sea
12
Seasonal heavy rainfall
13
Deep narrow valley with steep sides