Across
1
Long-term weather patterns of an area
4
Imaginary line around the middle of Earth
5
Low-lying land surrounded by higher ground
6
Large natural stream of water
9
Largest river in South America
Down
2
Land surrounded by water on three sides
3
Region near the equator
3
Region between the two tropic lines
7
Large slow-moving mass of ice
8
Half of the Earth
10
Line dividing two countries
11
Deep narrow valley with steep sides