The main agents of this type of weathering are: fungi, bacteria, decomposition of tree roots and debris in decomposition of larger organisms, among others. Tree roots are a major physical and biological weathering agents promoting the fragmentation of the rocks of the substrate.Īnother form of wear, promoted by organisms is accomplished by dissolution of rock components by producing organic acids from decomposition of organic material produced by the decomposition of these organisms, and this process is called chemical-biological weathering. The physical wear, called physical-biological weathering is done by breaking rock without chemical modification of the components thereof. Soil biology is quite varied, as illustrated in the image below, consisting of fungi, bacteria and higher organisms, such as earthworms and others. Act in physical attack Rock promoting the breakdown of rocky body into smaller units and the chemical attack on this rock. The agencies act directly and indirectly on the erosion of rock and soil evolution.
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