Which of the following factors represents the effect of the slope steepness on erosion in RUSLE?

The correct choice is the factor that represents the effect of slope steepness on erosion in the Revised Universal Soil Loss Equation (RUSLE), which is denoted as "L." This factor, known as the Length of Slope factor, addresses how the length and steepness of a slope influence the amount of soil loss due to erosion. A steeper slope typically increases the velocity of water flowing down the slope, which can enhance the erosive energy and lead to greater soil detachment and transport.

In RUSLE, slope steepness is critical because it directly affects how much water accumulates and how rapidly it moves, both of which are key drivers in the erosion process. The steeper the slope, the more significant the potential for erosion, especially during heavy rainfall events. Understanding this relationship allows practitioners to manage and mitigate erosion effectively in various land-use scenarios.

The other factors in RUSLE—K, C, and P—relate to different aspects of erosion. K represents the soil erodibility factor, C is the cover management factor indicating vegetation and land use, and P reflects the support practice factor, which includes measures taken to prevent erosion, such as contouring or terracing.