Across
1
Flat elevated area of land
4
Deep narrow valley with steep sides
7
Distance east or west of prime meridian
9
Large body of water partly enclosed by land
10
Low-lying land surrounded by higher ground
Down
2
Land surrounded by water
3
Mountain that can erupt with lava
5
Where river meets the sea
6
Cold treeless Arctic plain
8
Large slow-moving mass of ice
11
Largest river in South America