What is NOT a method of natural soil transport?

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Natural soil transport refers to the processes by which soil particles are moved from one location to another without human intervention. Methods of natural soil transport involve natural forces and environmental factors.

Wind, for instance, is a major natural agent that can carry fine particles over long distances, especially in arid and semi-arid environments. Settling in salt water relates to the deposition of particles in bodies of water due to gravity and density differences, which can occur naturally in coastal or estuarine areas. Gravity movement downslope, such as landslides or erosion, is another natural process where soil and rock materials are transported down hillsides by the force of gravity.

In contrast, digging by humans constitutes an anthropogenic activity, which does not occur naturally. It involves the active removal of soil, which alters the landscape and the distribution of soil particles but is not a method of natural transport. Thus, this option stands out as it directly involves human action rather than natural processes.