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2. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   The United States loses almost 3 tons of topsoil per acre per year. [16] 1 inch (2.5 cm) of topsoil can take between 500 [17] and 1,000 years [18] to form naturally, making the rate of topsoil erosion a serious ecological concern. Based on 2014 trends, the world has about 60 years of topsoil left.

3. Earthworks (engineering) - Wikipedia

   en.wikipedia.org/wiki/Earthworks_(engineering)

   Excavation may be classified by type of material: [1]: 13.1 Topsoil excavation; Earth excavation; Rock excavation; Muck excavation – this usually contains excess water and unsuitable soil; Unclassified excavation – this is any combination of material types; Excavation may be classified by the purpose: [1]: 13.1, 13.2

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5. Hardpan - Wikipedia

   en.wikipedia.org/wiki/Hardpan

   In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water .

6. Structural Soil - Wikipedia

   en.wikipedia.org/wiki/Structural_Soil

   Structural soil is composed of crushed stone (typically limestone or granite) narrowly graded from ¾-1 ½” highly angular with no fines, clay loam which should conform to the USDA soil classification system. The hydrogel is added in a small amount to prevent the separation of the stone and soil during mixing and installation.

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