Across
1
Deep narrow valley with steep sides
4
Wearing away of land by water or wind
5
Ridge of rock or coral near the surface
7
Flat elevated area of land
10
Landform where river meets the sea
11
Large slow-moving mass of ice
13
Body of water surrounded by land
Down
2
Line dividing two countries
3
Area where water covers the soil
6
Raised area of land, smaller than a mountain
8
Low area between mountains
9
Region surrounding the North Pole
12
Piece of land jutting into the sea