Explanation:

Demoiselles These are rock pillars which stand as resistant rocks above soft rocks as a result of differential erosion of hard and soft rocks. Zeugen A table-shaped area of rock found in arid and semi-arid areas formed when more resistant rock is reduced at a slower rate than softer rocks around it. A Dreikanter It is a type of ventifact that typically forms in desert or periglacial environments due to the abrasive action of blowing sand. A wind gap is a gap through which a waterway once flowed that is now dry as a result of stream capture.