Which of the following most directly prevents erosion in a watershed?

• A. Animal activity
• B. Rainfall
• C. Plant life
• D. Drought

Answer: (C)

Plant life directly helps prevent erosion by stabilizing soil and shielding it from the forces that move soil away. Roots weave through the soil, binding particles together so the ground is harder to erode, while the aboveground parts create a protective cover that slows rain’s impact on the soil and reduces the speed of surface water. That combination keeps soil in place, increases water infiltration, and minimizes sediment reaching streams in a watershed. Rainfall is the energy that drives erosion, drought reduces water flow but doesn’t actively prevent erosion, and while animal activity can disturb soil, it doesn’t provide the protective, binding effect that vegetation does.