Which of the following is not a factor of soil formation?

The correct answer is "land conservation". Soil formation is a natural process influenced by various factors including topography, parent material, climate, biota, and time. The topography of an area determines the drainage and accumulation of soil materials. Parent material refers to the underlying geological material that soil is formed from. Climate influences soil formation by affecting the rate of weathering, erosion, and organic matter decomposition. Biota refers to the living organisms that contribute to the formation of soil through decomposition and nutrient cycling. Land conservation is a human activity that aims to prevent soil degradation and erosion through the implementation of various practices. It does not directly influence the natural process of soil formation.