Across
1
Chain or group of islands
7
Largest ocean on Earth
8
Large natural stream of water
10
Raised area of land, smaller than a mountain
11
Flat grassland in tropical regions
12
Dry land with little rainfall
Down
2
Imaginary line around the middle of Earth
3
Ocean between Americas and Europe/Africa
4
Cold treeless Arctic plain
5
Large natural elevation of earth
6
Height above sea level
9
Deep narrow valley with steep sides
13
Region between the two tropic lines