The number of people aged between 0-15 and 64 and above who are dependent on the economically active age group (16 - 64). See Population Definitions
Case Studies help in understanding some of the things that are happening locally, nationally or internationally or have already happened in the past. You can use these case studies to supplement knowledge and most importantly as examples in essays.
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Physical Case Studies
El Nino Induced Drought in Zimbabwe (pdf) Download