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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. List of supermarket chains in the United States - Wikipedia

   en.wikipedia.org/wiki/List_of_supermarket_chains...

   Great Valu (Delaware, Maryland, New Jersey, North Carolina, Virginia, West Virginia) IGA; SpartanNash (in addition to directly owning a variety of Midwestern supermarket chains, SpartanNash is also a supplier for smaller, independent supermarkets) Thrift Way / Shop n Bag (New Jersey; Philadelphia) Unified Grocers; Wakefern Food Corporation

4. Soil carbon - Wikipedia

   en.wikipedia.org/wiki/Soil_carbon

   Soil carbon is the solid carbon stored in global soils. This includes both soil organic matter and inorganic carbon as carbonate minerals. It is vital to the soil capacity in our ecosystem. Soil carbon is a carbon sink in regard to the global carbon cycle, playing a role in biogeochemistry, climate change mitigation, and constructing global ...

5. 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 ...

6. Physical properties of soil - Wikipedia

   en.wikipedia.org/wiki/Physical_properties_of_soil

   Soil bulk density is equal to the dry mass of the soil divided by the volume of the soil; i.e., it includes air space and organic materials of the soil volume. Thereby soil bulk density is always less than soil particle density and is a good indicator of soil compaction. [47] The soil bulk density of cultivated loam is about 1.1 to 1.4 g/cm 3 ...

7. AOL Mail

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