What does soil that is left alone become?

Soil that is left undisturbed can undergo natural processes of ecological succession, leading to the development of a diverse ecosystem. Over time, it may accumulate organic matter, enhance nutrient cycling, and support a variety of plant and animal life. This can result in increased soil fertility and improved structure, ultimately fostering a more resilient and self-sustaining environment. Additionally, soil can develop distinct layers or horizons, reflecting its age and the ecological processes at play.