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I'm not sure you have got it right about how Sir Cliffy came into being. I think you will find that what happened was a randy tectonic plate jumped on another tectonic plate and the result was a Sir Cliffy Dover's cliffs are white because my Mrs gets me colouring them every weekend with a giant box of chalk!
Cliffs are formed by a number of processes, in particular the explosive energy released from waves (and stones carried within them) crashing into their base, the result of which leads to undercutting and eventual collapse of the overlying rock. Figure 2 below illustrates the process of undercutting; a large portion of the cliff base has been eroded and the overlying rock sits precariously above.Other factors contributing to cliff formation include precipitation (rain/snow/hail), which penetrates the natural cracks and fissures throughout the cliff, washing away and/or dissolving less resistant rock and weakening the stability of the cliff. The rate of erosion is accelerated by the freeze-and-thaw action during the winter months, during which time the expanding ice cracks the rock further, notably on the exposed outer surface. Erosion also occurs during the summer months, a which time the cliff is warmed and the evaporating water causes the sediment to contract and crack (porous rock only).As a result of the forces outlined above, cliffs are constantly changing and on the retreat; inevitably rock falls and large scale collapses occur unpredictably throughout the year.