Across
1
Large natural stream of water
5
Low area between mountains
6
Deep narrow valley with steep sides
7
Distance north or south of equator
8
Low-lying land surrounded by higher ground
10
Largest ocean on Earth
12
Tool for finding directions
Down
2
Large slow-moving mass of ice
3
Cold treeless Arctic plain
4
Flat grassland in tropical regions
9
Body of water surrounded by land
11
Vast body of salt water
13
Seasonal heavy rainfall