* Physical weathering is the process of breaking down rocks and minerals into smaller pieces without changing their chemical composition. This can occur through a variety of processes, such as freezing and thawing, abrasion, and exfoliation.
* Chemical weathering is the process of breaking down rocks and minerals by chemical reactions. This can occur through a variety of processes, such as oxidation, hydration, and hydrolysis.
* Biological weathering is the process of breaking down rocks and minerals by the activities of living organisms. This can occur through a variety of processes, such as the action of plant roots, the burrowing of animals, and the decomposition of organic matter.
Of these three types of weathering, only chemical weathering and biological weathering require the presence of water. Physical weathering can occur without water, but it is more effective when water is present.
