Soil And Soil Essay

Soil and rock are the main composition of the planet’s crust. Rock is often considered a consolidated material but soil is described as an unconsolidated remains and deposits of solid particle that have been formed by the breakdown of rocks. Soils can be grouped into two categories depending on the method of deposition. Residual soils have formed from the weathering of rocks and remain at the location of their origin. Residual soils can include particles having a wide range of sizes, shapes and compositions depending on amount and type of weathering and the minerals of parent rock. Transported soils are soils that have been relocated from their original place. Transportation may have resulted from the outcome of gravity, wind, water glaciers or human activities. Transported soil particles are often segregated according to size during the transportation process. The method of transportation and deposition has significant effect on the

• Water content: the smaller the moisture in the soil, the greater the soil suction will be, soil suction will hold its maximum value when the soil is free of any moisture (dry).
• Plasticity index of soil: soil suction will be greater in a soil which has greater plasticity index than in the one which has lower plasticity index.
• History of drying and wetting: soil suction is less during wetting time than it is during drying time.
• Soil structure: the size of interstices in a soil depends upon the structure of the soil, change in the formation would lead to change in the size of interstices and thus change the soil suction.
• Temperature: temperature changes can change the soil suction, temperature increase would decrease soil tension and result in decrease in suction, and alike, fall in temperature would cause an increase of