Bibliography
http://en.wikipedia.org/wiki/Soil
http://en.wikipedia.org/wiki/Drainage_basin
http://en.wikipedia.org/wiki/Natural_resources
http://en.wikipedia.org/wiki/Climate
http://en.wikipedia.org/wiki/Flora
http://en.wikipedia.org/wiki/Fauna
http://en.wikipedia.org/wiki/Landforms
http://en.wikipedia.org/wiki/Drainage_basin
http://en.wikipedia.org/wiki/Natural_resources
http://en.wikipedia.org/wiki/Climate
http://en.wikipedia.org/wiki/Flora
http://en.wikipedia.org/wiki/Fauna
http://en.wikipedia.org/wiki/Landforms