Across
1
Low-lying land surrounded by higher ground
4
Low area between mountains
5
Deep narrow valley with steep sides
6
Large slow-moving mass of ice
9
Height above sea level
10
Body of water surrounded by land
11
Goods sold to another country
Down
2
Cold treeless Arctic plain
3
Chain or group of islands
7
Flat elevated area of land
8
Distance north or south of equator
12
Vast body of salt water
13
Mountain that can erupt with lava