 Stonehenge
Materials stocks topsoil for every application. Topsoil is the
uppermost layer of soil, usually the top 2 to 6 inches. It has the
highest concentration of organic matter and microorganisms, and is
where most of the Earth's biological soil activity occurs. Plants
generally concentrate their roots in, and obtain most of their
nutrients from this layer. The actual depth of the topsoil layer can
be measured as the depth from the surface to the first densely
packed soil layer known as hardpan.
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