Which factor mainly contributes to soil erosion on slopes?

Rainfall impact is a significant contributor to soil erosion on slopes due to the energy of falling raindrops and the water runoff that it generates. When raindrops hit the soil, they can dislodge soil particles, especially on slopes where gravity pulls these particles downward. As water flows over the surface, it can carry these loosened particles away, leading to increased erosion. The amount of rainfall, its intensity, and duration are critical factors here; heavy rains can result in more substantial erosion compared to light showers.

In addition to the direct impact of rainfall, the water runoff can create rills and gullies, further exacerbating the erosion process on sloped terrain. Understanding the role of rainfall in soil erosion emphasizes the need for soil conservation practices, particularly in areas prone to heavy rain, in order to minimize the erosion and the subsequent loss of fertile soil.