The most obvious physical feature that distinguishes undisturbed mature soil from an immature soil is the
Answer Details
The most obvious physical feature that distinguishes undisturbed mature soil from an immature soil is the layered profile.
Undisturbed mature soils have developed over time through natural processes such as weathering, erosion, and the accumulation of organic matter. As a result, they have a distinctive layered structure called a soil profile, which consists of different horizons or layers.
These horizons are formed by the accumulation or loss of minerals, organic matter, and other materials over time, and can be distinguished by their color, texture, structure, and other physical properties. The uppermost horizon, known as the topsoil, is often the most fertile and productive layer for plant growth.
In contrast, immature soils lack this layered structure and have not yet developed the distinct horizons found in mature soils. This is because immature soils are typically formed from rock or other parent materials that have not yet undergone significant weathering or erosion.
Therefore, the most obvious physical feature that distinguishes undisturbed mature soil from an immature soil is the layered profile, which is the result of natural processes that have occurred over a long period of time.