Biological weathering is the removal of minerals and ions and physical changes due to growth or movement of organisms.
Burrowing and wedging by organisms like earthworms, termites, rodents etc., help in exposing the new surfaces to chemical attack and assists in the penetration of moisture and air.
Human beings by disturbing vegetation, ploughing and cultivating soils, also help in mixing and creating new contacts between air, water and minerals in the earth materials.
Decaying plant and animal matter help in the production of humus, carbonic and other acids which enhance decay and solubility of some elements.
Plant roots exert a tremendous pressure on the earth materials mechanically breaking them apart.

Exfoliation

Exfoliation is the flaking off of more or less curved sheets of shells from over rocks or bedrock results in smooth and rounded surfaces
Exfoliation can occur due to expansion and contraction induced by temperature changes. Exfoliation domes and tors result due to unloading and thermal expansion respectively.

Erosion

Erosion is the process of removal of rock debris from one place to another.
When massive rocks break into smaller fragments through weathering and any other process, erosional geomorphic agents like running water, groundwater,
glaciers, wind and waves remove and transport it to other places depending upon the dynamics of each of these agents.
The process of abrasion by rock debris carried by these geomorphic agents aids greatly in erosion.
The landscape is worn down by the erosion, relief degrades. Weathering, mass-wasting and erosion are degradational processes.
Erosion is largely responsible for continuous changes that the earth’s surface.
The denudational processes like erosion and transportation are controlled by kinetic energy.
The erosion and transportation of earth materials is brought about by wind, running water, glaciers are controlled by climatic conditions
The work of the other two agents of erosion-waves and ground water is not controlled by climate.

The erosional agents lose their velocity and hence energy on gentler slopes and the materials carried by them start to settle themselves.
The coarser materials get deposited first and finer ones later.
By deposition depressions get filled up.
The same erosional agents viz., running water, glaciers, wind, waves and groundwater act as aggradational or depositional agents also