Across
1
Deep narrow valley with steep sides
4
Large body of water partly enclosed by land
6
Flat grassland in tropical regions
7
Large natural elevation of earth
8
Large slow-moving mass of ice
9
Goods sold to another country
11
Largest hot desert in the world
Down
2
Largest ocean on Earth
3
Chain or group of islands
5
Mountain that can erupt with lava
10
Seasonal heavy rainfall
12
Total number of people in an area
13
One of seven major landmasses