Physical reasons for desertification in The Sahel
1950/60’s - above average rainfall, causing nomadic herders to settle and farmers to intensify agriculture.
1970’s - below average rainfall leading to extreme drought. Crops and animals die. Desert advances.
Desertification: an animation With thanks to Staffordshire County Council
Use this flow chart to explain the causes of desertification Vegetation roots bind soil. Vegetation dies. Soil is left exposed. Sun bakes the soil and it cracks. Wind blows away soil. No leaves to intercept rain. Soil is washed away. The soil is degraded, losing fertility and structure.