The aim of this book is to examine the nature of landforms, soils and geomorphological processes in deserts. Since deserts comprise over 20 % ( twenty per cent ) of the earth's land surface, the task is important and the prodigious literature shows that its significance has long been realized. Including recent research findings from terrestrial satellite imagery, the study of planetary landscapes, and advances in laboratory work, this also covers the environmental processes involved in desertification and the solution of planning.