Across
1
Ridge of rock or coral near the surface
3
Deep narrow valley with steep sides
4
Tool for finding directions
6
Imaginary line around the middle of Earth
9
Land surrounded by water on three sides
10
Height above sea level
Down
2
Largest hot desert in the world
3
Piece of land jutting into the sea
5
Vast body of salt water
7
Line dividing two countries
8
One of seven major landmasses
11
Flat grassland in tropical regions