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en.wikipedia.org/wiki/Soil

A typical soil is about 50% solids (45% mineral and 5% organic matter), and 50% voids (or pores) of which half is occupied by water and half by gas. The percent soil mineral and organic content can be treated as a constant (in the short term), while the percent soil water and gas content is considered highly variable whereby a rise in one is simultaneously balanced by a reduction in the other.

www.nrcs.usda.gov/wps/portal/nrcs/detail/nj/home/?cid=nrcs141p2_018993

Soil “horizons” are discrete layers that make up a soil profile. They are typically parallel with the ground surface. In some soils, they show evidence of the actions of the soil forming processes. O horizons are dominated by organic material. Some are saturated with water for long periods or ...

www.fao.org/docrep/field/003/AC172E/AC172E03.htm

COMPOSITION OF SOIL. Soil is a complex body composed of five major components (Fig. 1.3 namely: ... The clay fraction, because of its high surface area, is the most active part of the soil controlling many of the chemical and physical properties of the soil. It is the seat of soil fertility.

organiclifestyles.tamu.edu/soilbasics/soilchemical.html

The organic fraction of a soil, although usually representing much less than 10% of the soil mass by weight, has a great influence on soil chemical properties. Soil organic matter is composed chiefly of carbon, hydrogen, oxygen, nitrogen and smaller quantities of sulfur and other elements. The organic fraction serves as a reservoir for the ...

study.com/academy/lesson/soils-chemical-composition-environmental-effects.html

Soil is extremely important for all life on Earth. Animals and plants need soil to live. In this lesson, we are going to learn what soil is made of, explore different types of soil, and discover ...

www.earthsoils.com/soil-composition

Soil Composition and Crop Quality This chart reflects a tremendous amount of information available for your understanding of the composition of a healthy productive soil environment. It is based on scientific research accumulated over years of observation on productive soil types throughout many growing areas of the country. The approach to obtaining this insight on …

shop.sciencefirst.com/environmental-kits/7051-chemical-composition-of-soil.html

Chemical Composition of the Soil. Permits students to perform chemical determinations on locally derived soils to determine percentage of water, organic content, pH, and the presence of calcium, carbonates, magnesium, phosphates, sulfates, potassium, nitrate, ammonium and iron. Provides an accurate profile of the chemical nature of the soil.

www.brighthubengineering.com/.../119617-geotechnical-topics-soil-properties

Determination of physical and chemical properties of soil are equally important for civil engineers and agriculturists. Index test soil properties methods are implemented to determine plastic limit, liquid limit, shrinkage limit and other properties of soil which must be studied and analyzed before constructing any building over a soil mass. other than that physical and chemical properties of ...

melscience.com/US-en/articles/how-determine-composition-soil

How to determine the composition of soil How to determine the composition of soil Making the ground analysis at home. Share Tweet Send An ex­cel­lent way of ap­ply­ing the­o­ret­i­cal knowl­edge of physics and chem­istry in prac­tice is to de­ter­mine the com­po­si­tion of soil. ... Soil is a sys­tem lo­cat­ed in the up­per ...

answers.yahoo.com/question/index?qid=20070417165938AA1PPYO

Best Answer: Dirt is such a varied mixture of different minerals and compounds that almost anything can be included. However, the most common rocks make the most common components. This would usually mean a lot of quartz (silicon dioxide, SiO2), limestone (calcium carbonate, CaCO3), and all the other usual suspects.