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On the Earth, gravity- and radiation-driven geomorphic systems interact independently, so that their two types of activity can mingle under conditions of periodic random dominance. Thus, peak energy expenditures engendered by each type of system may or may not coincide geographically. Maximum rates of landform change occur where active orogenesis mingles with changing climates. Minimal change occurs where epeirogenic regions are occupied by morphogenic areas that are in states of dynamic equilibrium. In this arrangement of interacting geomorphic systems, there is clearly a place for both catastrophe and gradualism. There also is a place for cycles of erosion of several ...(100 of 6609 words)