Across
1
Mountain that can erupt with lava
5
Steep rock face at edge of land
6
Imaginary line around the middle of Earth
7
Deep narrow valley with steep sides
8
One of seven major landmasses
9
Region near the equator
10
Large natural stream of water
11
Low area between mountains
12
Half of the Earth
Down
2
Large area covered with trees
3
Height above sea level
4
Wearing away of land by water or wind
13
Land surrounded by water