Which factor is listed as a natural cause of landslides?

• A. Increased agricultural practices
• B. Erosion at the base of a slope
• C. Urban development
• D. Road construction

Answer: (B)

The correct answer is based on the understanding that natural causes of landslides primarily involve geological and environmental processes. Erosion at the base of a slope is a significant natural factor that can destabilize the ground. When the base of a slope erodes, it removes the support for the material above, leading to a potential slide. This process is often exacerbated by factors such as water drainage patterns, heavy rainfall, and the inherent characteristics of the soil or rock layers involved.

In contrast, increased agricultural practices, urban development, and road construction are human-induced factors that often contribute to landslides by altering the landscape, changing drainage patterns, and increasing the load on slopes. While they can certainly increase the likelihood of landslides, they are not classified as natural causes, which is why erosion at the base of a slope is the most relevant choice in this context. Hence, the natural processes that contribute to landslides are crucial to understanding landslide susceptibility and prevention.