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  • Created by: Molly
  • Created on: 06-06-11 15:54

          Why desertification occurs:

·         Deserts extend into nearby savannah areas because global warming is resulting in longer periods of drought in these areas

·         high population growth rates cause over cultivation of marginal lands and thus soils are more easily eroded

·         deforestation caused by increased demand for wood for cooking results in less transpiration and lower rainfall totals

               Key points:

·         Over cultivation due to population growth; High birth rates, more food needed increases pressure on land through over cultivation

·         Overgrazing,




very useful

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