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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. USDA soil taxonomy - Wikipedia

   en.wikipedia.org/wiki/USDA_soil_taxonomy

   USDA soil taxonomy (ST) developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters (most commonly their properties) and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series.

4. Soil stockpile - Wikipedia

   en.wikipedia.org/wiki/Soil_Stockpile

   A soil stockpile is formed with excavated topsoil during the construction of buildings or infrastructure. It is considered to be an important resource in construction and ecology . [ 1 ] [ 2 ] Soil is stockpiled for later use in landscaping or restoration of the region following the removal of construction infrastructure. [ 3 ]

5. Soil in the United States - Wikipedia

   en.wikipedia.org/wiki/Soil_in_the_United_States

   Soils are the product of climate, organisms and topography, acting on parent (geologic) material over time. Thus the great diversity of geologic materials, geomorphic processes, climatic conditions, biotic assemblages and land surface ages in the United States is responsible for the presence of an enormous variety of mineral and organic soils.

6. List of U.S. state soils - Wikipedia

   en.wikipedia.org/wiki/List_of_U.S._state_soils

   This is a list of U.S. state soils.A state soil is a soil that has special significance to a particular state.Each state in the United States has selected a state soil, twenty of which have been legislatively established.

7. Ultisol - Wikipedia

   en.wikipedia.org/wiki/Ultisol

   Map of the United States showing what percentage of the soil in a given area is classified as an Ultisol-type soil. The great majority of the land area classified in the highest category (75%-or-greater Ultisol) lies in the South and overlays with the Piedmont Plateau, which runs as a diagonal line through the South from southeast (in Alabama) to northwest (up into parts of Maryland).