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Chapter 8: Cycles
Cycles represent natural systems in which matter and energy are continuously transferred between different spheres of the environment. Their study involves the recognition of stores, fluxes and residence times, with hydrological, geological, and biogeochemical cycles providing the global context for landform science. Whereas cycles can be repeated, portions of cycles, as cascades or trajectories, are unidirectional. Temporal cycles include those in Milanković theory, as well as short-term cycles that enable different orders of magnitude of change to be identified, as cycles, or portions of cycles, that are more specifically geomorphic. Spatial cycles, usually referred to as cascades, involve erosion and deposition aspects of denudation, and geomorphology is central to understanding the temporal phasing of environmental flows.
A cycle is a natural process ...