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The wide range of both spatial and temporal scales distinguishes landslide processes significantly from other natural processes such as floods, earthquake shaking or tsunamis. Some examples of the range of landslide occurrences are given in Figure 3.2. The relative spatial and temporal coverage of these examples is indicated in Figure 3.1. Despite these extreme variations, some general patterns of occurrences can be recognized. The spatial and temporal behaviour of landslides and the occurrence of specific types of landslide can be linked to particular environmental domains, but only in the most