High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Soil is essential to most life on the earth. It is a relatively thin crust where an even smaller portion contains much of the biological activity. Soil consists of three different phases. A solid phase ( 50%) that contains mainly minerals of varying sizes as well as organic compounds. The rest is pore space. This space contains the liquid and gas phases In order to understand porosity better a series of equations have been used to express the quantitative interactions between the three phases of soil.
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