If the soil forms from material that was transported to the location by erosion, it is transported soil. Soil is the organic remains of decomposed vegetation. In agricultural soil, it is the medium that supports crop plants, both physically and biologically. Soil may be from a few inches to several feet thick. The inorganic fraction of soil may include various sizes and shapes of rocks and minerals, in order of increasing size. These are clay, silt, sand, gravel, and stone. Coarser soils have lower capacity to absorb organic plant nutrients, gases, and water, which are important for plants. Soils tend to absorb substances, so therefore they are usually better suited for agriculture.
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