Rocks and minerals are formed under a very high temperature and pressure, exposed to atmospheric conditions of low pressure and low temperature and they become unstable and weather. Soils are formed from rocks through the intermediate stage of formation of Regolith which…
The rocks are disintegrated and are broken down to comparatively smaller pieces, with out producing any new substances 1. Physical condition of rocks: The permeability of rocks is the most important single factor. Coarse textured (porous) sand stone weather more readily…
Decomposition of rocks and minerals by various chemical processes is called chemical weathering. It is the most important process for soil formation. Chemical weathering takes place mainly at the surface of rocks and minerals with disappearance of certain minerals and…
Unlike physical and chemical weathering, the biological or living agents are responsible for both decomposition and disintegration of rocks and minerals. The biological life is mainly controlled largely by the prevailing environment. 1. Man and Animals: The action of man in…
There are many factors which influence the weathering of minerals. 1. Climatic conditions 2. Physical characteristics 3. Chemical and structural characteristics 1. Climatic Conditions: The climatic condition, more than any other factor tends to control the kind and rate of weathering.…
The most important silicates are quartz, feldspar and certain Ferro magnesium minerals Weathering products of common silicate minerals Minerals Composition Decomposition products Minerals Others Olivine (Fe, Mg)2SiO2 serpentine, limonitehaematite, quartz Some Si in solution, carbonates of Fe and Mg Pyroxenes…
The soil formation is the process of two consecutive stages. The weathering of rock (R) into Regolith The formation of true soil from Regolith The evolution of true soil from regolith takes place by the combined action of soil forming…
The passive soil forming factors are those which represent the source of soil forming mass and conditions affecting it. These provide a base on which the active soil forming factors work or act for the development of soil. Parent Material: It is…
Definition of Soil Whitney (1982) Hilgard (1892) Dokuchaiev (1900) Joffe (1936): Soil is a natural body of mineral and organic constituents differentiated into horizons usually unconsolidated, of variable depth which differs among themselves as well as from the underlying parent…
Soil Science has six well defined and developed disciplines. Scope of soil Science is reflected through these disciplines. Soil Science : The science dealing with soil as a natural resource on the surface of the earth, including Pedology (soil genesis, classification…
