This publication will introduce you to the engineering properties of soil and rock. You will learn how the properties of compaction, permeability, consolidation-swell, shear strength, stress-strain modulus (modulus of elasticity), and Poisson's ratio are determined and used in design of foundations of structures. You will learn about the compaction characteristics of soils, how the relative density of cohesionless soils influences the angle of internal friction, the definition of relative compaction of soils, and many other concepts that are the basis of applying the engineering properties of soil and rock to design of foundations of buildings and earth structures.