Across
1
Imaginary line around the middle of Earth
6
Wearing away of land by water or wind
7
Region surrounding the North Pole
10
Large slow-moving mass of ice
11
Height above sea level
Down
2
Ridge of rock or coral near the surface
3
Large natural elevation of earth
4
Dry land with little rainfall
5
Largest hot desert in the world
8
Deep narrow valley with steep sides
9
Mountain that can erupt with lava