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Department of Civil Engineering CE 42- SOIL MECHANICS
UNIT-I 
INTRODUCTION 
 
SOIL AND SOIL ENGINEERING 
* The term Soil has various meanings, depending upon the general field in which it is 
being considered. 
*To a Pedologist ... Soil is the substance existing on the earth's surface, which grows and 
develops plant life. 
*To a Geologist ..... Soil is the material in the relative thin surface zone within which 
roots occur, and all the rest of the crust is grouped under the term ROCK irrespective 
of its hardness. 
*To an Engineer .... Soil is t...