Which process is a classic example of chemical weathering?

• A. Oxidation and hydrolysis
• B. Frost wedging
• C. Abrasion by wind
• D. Thermal expansion

Answer: (B)

Chemical weathering involves minerals undergoing chemical reactions that change their makeup. Oxidation and hydrolysis are classic examples because they chemically alter minerals: oxidation converts iron-bearing minerals to oxides, and hydrolysis reacts with water to form new minerals like clays. In contrast, frost wedging, abrasion by wind, and thermal expansion are physical processes that break rocks without changing their chemical composition. So, oxidation and hydrolysis best illustrate chemical weathering.