Which practice is listed as a method to reduce soil erosion?

• A. Crop rotation
• B. Overgrazing
• C. Deforestation
• D. Contour plowing

Answer: (D)

Slowing and keeping soil in place on sloped land is a key way to reduce soil erosion. Contour plowing achieves this by plowing along the natural curves of the hill, creating small ridges that act as barriers to runoff. These ridges slow rainwater, give it a chance to soak in, and keep more topsoil from washing away during storms. That direct effect on water flow makes contour plowing the best choice for preventing soil loss on slopes.

Overgrazing and deforestation remove protective vegetation and expose soil, making erosion more likely. Crop rotation helps maintain soil health and can reduce erosion over time, but it doesn’t provide the same immediate runoff-control benefit on slopes as contour plowing.