사막화

Also known as dune movement

upright=1.4|thumb|Global distribution of Drylands|dryland areas based on the [[aridity index computed over a 30-year average during 1981 to 2010. Typical deserts are indicated by the hyper-arid category (light yellow).]] thumb|right|234px|Extreme desertification in Somalia Desertification is a type of gradual land degradation of fertile land into arid desert due to a combination of natural processes and human activities.