Tothe engineer, the matenals making up the Earth's crust aredividedinvariably into the categories of soil. Differing fromthe way anagronomist considers soil, the engineer's concernwith the same liesin the fact that it more far-ranging, goingbeyond an agriculturalnecessity as the natural medium forgrowth of all land plants; forengineers, the term soil extendsfrom the ground surface down to itscontact with a layer ofhard rock.
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