A mature soil profile

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Soil - Soil Profiles And Horizons Below the surface of the earth lie layers of soil that are exposed when people dig into the earth, or by natural forces like earthquakes. Soil scientists have developed a number of systems for identifying and classifying soils. A Horizon Beneath the O horizon is the A horizon. Reference Entries mature soil in A Dictionary of Environment and Conservation Length: From the surface downward, they are named O if they form at the land surface and are almost entirely constituted of litter and humus , A if they form at or near the land surface and show some humus accumulation, E if they lie below the land surface and exhibit a significant loss of clay and humus that gives them a bleached appearance, B if they are subsurface and show accumulations of material from upper layers, C if they are largely unweathered, unconsolidated subsurface mineral layers frequently the parent material from which the upper layers have formed , and R if they are consolidated bedrock. The tropical belt around the earth's equator contains the globe's "oldest" soils. Plants have adapted to the globe's variety of soils and can grow in almost every soil and under all variations of weather, yet plants grow better in some places than others, especially in places where nutrients are most readily available from the soil.
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Soil Genesis and Development, Lesson 4 - Soil Profile Development

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Soils: Soil Profiles

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Soils - Part 1: The Origin and Development of Soil (How Soil Gets a Life and a Name)

Depending on the soil-forming factors in an area, weathering may proceed rapidly over a decade or slowly over millions of years. This compares to the loess soils in Nebraska, which are only 10 to 50 thousand years old. How does contour plowing conserve soil? By examining a soil profile, we can gain valuable insight into soil fertility.
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