Across
1
Imaginary line around the middle of Earth
5
Height above sea level
6
Raised area of land, smaller than a mountain
8
Seasonal heavy rainfall
11
Largest river in South America
Down
2
Low-lying land surrounded by higher ground
3
Area where water covers the soil
4
Where river meets the sea
7
Mountain that can erupt with lava
9
Distance north or south of equator
10
Flat elevated area of land