What type of erosion occurs where runoff flows uniformly across a slope?

Sheet erosion is the correct answer because it refers to a process where water runoff flows uniformly over a surface, removing thin layers of soil in a continuous manner. This type of erosion tends to be subtle and occurs over larger areas where the water sheet flows rather than concentrating in specific channels. It can lead to the gradual loss of topsoil, which is crucial for plant growth.

Understanding this phenomenon is essential in landscape management and soil conservation, as it highlights the importance of maintaining vegetation cover and employing practices that can slow down water flow to minimize its impact. The other types of erosion, such as gully, rill, and channel erosion, involve more concentrated water flow and typically result in more pronounced and visible soil loss, making them distinct from the uniform action characteristic of sheet erosion.