The purpose of this online publication is to provide information on deserts. This site deals with general issues including aridity, desert types, eolian processes, types of dunes and desert features. Furthermore the problem of desertification is discussed. Information about deserts from the U.S. Geological Survey. Topics : What Is a Desert; How the Atmosphere Influences Aridity; Where Deserts Form; Types of Deserts; Desert Features; Eolian Processes; Types of Dunes; Remote Sensing of Arid Lands; Mineral Resources in Deserts; Desertification.