Check you understand the terms surplus and deficit!
There is some useful information to be found here;
http://www.youtube.com/watch?v=q7mACjecoz4
http://www.youtube.com/watch?v=iRGZOCaD9sQ
WHAT DO THESE PIE CHARTS SHOW?
(Use terms like LEDC and MEDC in your answer. Can you describe patterns - highest, lowest, anomalies?)
http://www.bbc.co.uk/schools/
gcsebitesize/geography/water_rivers/water_usage_rev1.shtml
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