Soil formation and soil types :
1.On the basis Of geological origin soil may organic or inorganic types
Bentonite : Decomposed volcanic ash containing a high % of clay mineral ex. Montmorillonite
Black Cotton soil : It contain the mineral montmorillonite and contain large swelling and shrinkage.
Loam : It is a mixture of sand, silt and clay size particles in equal ratio.
Moorum : It is gravel mixed with red clay.
Varved clay : It is clay and slit of glacial origin usually a lacustrine deposited.
1.Geometric arrangement of soil particles with respect to one another is known as soil structure.
Single Grained Structure:
1.Found in coarse grained soils like gravel and sand.
1.It is possible for fine sand or silts.