Across
1
Deep narrow valley with steep sides
3
Ridge of rock or coral near the surface
5
Flat elevated area of land
7
Vast body of salt water
9
Line dividing two countries
Down
1
Piece of land jutting into the sea
2
Landform where river meets the sea
4
Wearing away of land by water or wind
5
Largest ocean on Earth
6
Largest river in South America
8
Large slow-moving mass of ice
10
Steep rock face at edge of land