The three main types of weathering are physical weathering, mechanical weathering, and chemical weathering.

Mechanical weathering is the physical breakdown of rocks and minerals into smaller pieces that retain the chemical composition of the parent material. (Body from which the weathered material originated.) Once again, under mechanical weathering, there are other processes that take place such as:

Frost action simply involves water creeping in rock crevices and freezing. Where the ice formed expands, it wedges itself into these crevices. This is known as Frost wedging. E.g. Talus slope, Lost River, West Virginia, USA.

When ice thaws, it causes parts of the rock to be dislodged from the main body.

Thermal expansion and contraction are to do with the volume of the minerals in rocks changing (expanding and contracting) in response to cooling and heating. Another important factor h

The older rocks get, the easier it is for them to get weathered away. Different climatic conditions have different weathering effects. Chemical processes go faster at higher temperatures and in presence of liquids. Therefore, chemical weathering is more effective in tropics than in arid and arctic regions because temperatures and rainfall are high and evaporation rates are low. Also vegetation and animals are abundant in tropics.

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