Which of the following is indicative of erosion?

Erosion is the process by which soil, rock, or other surface material is worn away and transported by natural forces such as wind, water, or ice. Soil movement by water is a clear example of this process, as it involves the movement of particles due to the force of flowing water. This can occur in a variety of environments, such as rivers, streams, and during rainfall when water runs over the landscape, displacing soil and sediment.

Formation of sedimentary rocks is related to the accumulation and lithification of sediments, which may have been transported by erosion but does not directly indicate the erosive process itself. Wind shaping a landscape is associated with erosion, particularly in arid environments, but it is less specific than water movement in emphasizing the transport aspect of erosion. Plant growth on a hillside does not typically indicate erosion; instead, it can help stabilize soil and reduce erosion by providing root structures that hold the soil in place.

Thus, the movement of soil by water is the most direct representation of erosion, focusing on the transport and wearing away of materials from one location to another.