Introduction To Soil Exploration
The soil is in contrast to various materials used in civil engineering, which include bitumen, steel, cement or concrete, brick, and aggregate. These materials have a clear definition of quality which makes them outstanding worldwide.
However, this luxury option is not available to geotechnical engineers. It is essential to deal with both the soil and rock which is present at the specific location.

Due to the natural sources, soil and rock have no prescribed standards of quality. Their properties change from one place to another, and particularly in similar work areas, soil properties can change within a small depth or distance.