List the types of soils depending upon it's formation. [2071 Bhadra] [2]

On the basis of the formation of soil, Soils can be divided into following two groups:

• Residual Soils
• Transported Soils

Residual Soils:

Residual soils are those soils that remains at the place of their formation as a result of the weathering of the parent rocks. The depth of residual soils depends primarily on climatic conditions and the time of exposure. An important characteristics of the residual soil is that the sizes of the grains are indefinite.

Transported Soils:

Transported soils are the soils that are found at locations far from their place of formation. The transporting agencies of such soils are glaciers, wind and water. The soils are named according to the mode of deposition as:

• Alluvial deposit
• Lacustrine deposit
• Marine deposit
• Aeolian deposit

Alluvial deposit:

Soils that has been deposited from suspension in running water are alluvial deposits.

Lacustrine deposit:

Soils that has been deposited from suspension in still, fresh water of lakes are lacustrine deposits.

Marine deposit:

Soils that has been deposited from suspension in sea water.

Aeolian deposit:

Soils that have been transported by winds are aeolian soils.
 Glacial soils:

Soils that have been transported by ice are glacial soils.