What do you mean by desertification???

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Explanation:

he United Nations' official definition says desertification is land degradation in typically dry areas resulting from various factors, including climatic variations and human activities. ... Many things can cause desertification. Drought, overgrazing, fire, and deforestation can thin out vegetation, leaving exposed soil

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As the organization and management of resources and responsibilities for dealing with all humanitarian aspects of emergencies, in particular preparedness, response and recovery in order to lessen the impact of disasters.