Soils - Part 1: The Origin and Development of Soil (How Soil Gets a Life and a Name)
The weathering forces, as influenced by the five soil-forming factors, result in the formation of soil from rocks and parent materials. However, the soil formed is not just a loose unconsolidated, disorganized mass of various size particles. The soil has definite organized qualitative and quantitative characteristics reflecting the forces from which it was formed.
• The more horizons that are present, the older the soil.
Soil age is not an exact measure. It is usually described simply as young, mature or old. A young soil has a thin A horizon and often no B horizon. A mature soil has A and B horizons of average thickness which show some differences from each other. An old soil shows thick horizons which are very different from each other. Horizons are described in more detail in the following section.
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