Differential Erosion / Weathering
Differential Erosion / Weathering : These features develop in rocks which have varying resistance to the agencies of erosion and/or weathering so that parts of the rock are removed at greater rates than others. A typical example is the removal of soft beds from between harder beds in a series of sedimentary rocks. The term may be applied to any size of feature, from small-scale >etching= to the regional development of hills and valleys controlled by hard and soft rocks