The results are more serious: for where there are trees ,their roots break the soil up-allowing the rain to sink-and also hold the soil thus preventing itbeing washed away easily. but where there are no trees the soil becomes hard and poor.The rain falls on hard ground andflows away on the surface causing floodsand carry with it the rich top-soil inwhich crops grow so well. When all thetop-soil is gone nothing remains butworthless desert.