Which of the following factors does NOT influence soil formation?

• A. Parent material
• B. Climate
• C. Topography
• D. Building materials

Answer: (D)

The factor that does not influence soil formation is building materials. Soil formation is primarily influenced by natural factors such as parent material, which provides the mineral content of the soil; climate, which affects weathering processes and vegetation growth; and topography, which influences drainage, erosion, and microclimates.

Building materials, on the other hand, are man-made and refer to materials used for construction, like brick, concrete, and wood. They do not play a role in the natural processes that lead to the development of soil, which is formed through the interaction of the aforementioned natural factors over time. Thus, building materials are not a factor in soil formation.