Post on 15-Nov-2015
description
Soil and its Formation
Soil and its FormationRoman Poudyal
Department of Civil and Environmental EngineeringOklahoma State University
OutlineWhat is soil?
How it form?
Definition of SoilIn generalUpper layer of mantle that may be dug or plowed and which serves as a natural medium for the growth of plantsIn EngineeringUpper layer of mantle is termed as top soilUnconsolidated material, composed of solid particles and void spacesVoid space may contain air, water or both
Soil FormationFormed from weathering of rock and minerals
Long period of time (800 to 1000 years or more) is required
Weathering:Physical weathering processChemical weathering process
Physical WeatheringPhysical processes breaks down the rocksFreezing and thawing
Temperature changes (Cracks)
Chemical WeatheringChemical reactions between rock mineral and different elements
Chemical reactions
Soil Formation (cont.)Weathered particle starts to deposit at same place or at new transported location
Deposition starts to mix with other organic matter
Over period of time layer of soils starts to form
Thank You!!Questions??