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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. Landfill - Wikipedia

    en.wikipedia.org/wiki/Landfill

    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).

  4. Landfills in the United States - Wikipedia

    en.wikipedia.org/wiki/Landfills_in_the_United_States

    Over 150 m (490 ft) of garbage has risen from the ground since the area became a designated landfill site in 1957. [25] In 1986, there were 7,683 landfills in the United States. By 2009, there were just 1,908 landfills nationwide: a 75 percent decline in disposal facilities in less than 25 years. [26]

  5. Soil contamination - Wikipedia

    en.wikipedia.org/wiki/Soil_contamination

    v. t. e. Soil contamination, soil pollution, or land pollution as a part of land degradation is caused by the presence of xenobiotic (human-made) chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals or improper disposal of waste. The most common chemicals involved ...

  6. Hardpan - Wikipedia

    en.wikipedia.org/wiki/Hardpan

    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. Some hardpans are formed by deposits in the soil ...

  7. Natural Resources Conservation Service - Wikipedia

    en.wikipedia.org/wiki/Natural_Resources...

    Website. www.nrcs.usda.gov. Natural Resources Conservation Service (NRCS), formerly known as the Soil Conservation Service (SCS), is an agency of the United States Department of Agriculture (USDA) that provides technical assistance to farmers and other private landowners and managers. Its name was changed in 1994 during the presidency of Bill ...

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