Concept:In deserts, water rarely flows, but when it does, it carves out dry channels called wadis.Explanation:Deserts can receive sudden, heavy rainfall. This running water quickly cuts temporary channels into the ground. After the rain stops, the channels dry up. These steep-sided, dry valleys are known as wadis.Barchans, zeugens, and yardangs are all erosional or depositional landforms made by wind action. They are not produced by water.Answer:D. wadis