Across
1
Distance east or west of prime meridian
5
Low area between mountains
6
Half of the Earth
8
Piece of land jutting into the sea
10
Large natural elevation of earth
12
Deep narrow valley with steep sides
13
Ridge of rock or coral near the surface
Down
2
Wearing away of land by water or wind
3
Large slow-moving mass of ice
4
Line dividing two countries
7
Raised area of land, smaller than a mountain
9
Largest hot desert in the world
11
Flat grassland in tropical regions