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The movement of lithospheric plates is the main cause of convergent and divergent movements affecting thousands of kilometres of the Earth’s surface. As shown in Figures 33 and 34, these horizontal movements are generally accompanied by vertical movements that can produce very large scenic features, such as a mountain belt or a rift valley. In this book we are primarily concerned with scenic features at a more local scale, so we now consider various other processes that may be important in creating vertical crustal movements without contributions from large-scale plate interactions.

FIG 33. The most important types of folds and faults, and the local patterns of forces responsible.