What is one function of mulch in erosion control?

One of the primary functions of mulch in erosion control is its ability to protect the soil surface from raindrop impact. When rain falls on bare soil, the force of the raindrops can dislodge soil particles, leading to erosion. By covering the soil with mulch, it absorbs the energy from the raindrops, reducing the likelihood of soil compaction and erosion. This protective layer helps to maintain soil structure and minimizes surface runoff, ultimately promoting better soil stability and health.

While other options may suggest beneficial aspects related to mulch, such as enhancing plant growth or reducing watering needs, these do not directly address the critical role of mulch in protecting the soil against erosion. The primary function that aligns with erosion control focuses on the physical barrier mulch provides, making it a vital component in effective erosion and sediment control practices.