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Unsaturated Zone Hydrology by Gary L. Guymon - Professor of Civil Engineering, Department of Civil and Environmental Engineering, University of California, Irvine CA 92717

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Chapter 2Soils

Many disciplines study soils: soil scientists, geologists, geotechnical engineers, and agronomists to name a few. Each discipline has evolved a system of classification and description of soils that is appropriate to their needs and in some cases there is little commonality in the use of terms between disciplines. For example, soil to a geotechnical engineer generally means any material that is diggable. This description is largely useless to the soil scientist. We will, where possible, try to choose a middle ground in dealing with this great variety of terms.

2.1 Geologic Origin of Soils

2.1.1 Rock Types

The word rock is used generally to denote the earth’s terrestrial materials. There are basically three fundamental rock types: ...

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