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2. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

3. Dillo Dirt - Wikipedia

   en.wikipedia.org/wiki/Dillo_Dirt

   Dillo Dirt. Dillo Dirt is a compost made by the City of Austin, Texas since 1989. It was the first program of its kind in the state and one of the oldest in the nation. [1] Dillo Dirt is named after the nine-banded armadillo (Dasypus novemcinctus), which is a mammal native to Texas. It is also a trademarked product of the City of Austin Water ...

4. Structural Soil - Wikipedia

   en.wikipedia.org/wiki/Structural_Soil

   Structural Soil is a medium that can be compacted to pavement design and installation requirements while permitting root growth. It is a mixture of gap-graded gravels (mostly made of crushed stone) and soil (mineral content and organic content). It provides an integrated, root penetrable, high strength pavement system that shifts design away ...

5. Coal combustion products - Wikipedia

   en.wikipedia.org/wiki/Coal_combustion_products

   Photomicrograph made with a scanning electron microscope and back-scatter detector: cross section of fly ash particles. Fly ash, flue ash, coal ash, or pulverised fuel ash (in the UK)—plurale tantum: coal combustion residuals (CCRs)—is a coal combustion product that is composed of the particulates that are driven out of coal-fired boilers together with the flue gases.

6. Soil contamination - Wikipedia

   en.wikipedia.org/wiki/Soil_contamination

   Municipal and industrial wastes contribute most to soil contamination (38%), followed by the industrial/commercial sector (34%). Mineral oil and heavy metals are the main contaminants contributing around 60% to soil contamination. In terms of budget, the management of contaminated sites is estimated to cost around 6 billion Euros (€) annually ...

7. Landfill - Wikipedia

   en.wikipedia.org/wiki/Landfill

   Ecology portal. v. t. e. A landfill[ a] is a site for the disposal of waste materials. It is the oldest and most common form of waste disposal, although the systematic burial of waste with daily, intermediate and final covers only began in the 1940s. In the past, waste was simply left in piles or thrown into pits (known in archeology as middens ...