What type of weathering involves chemical alterations of minerals in rocks?

• A. Mechanical weathering
• B. Chemical weathering
• C. Thermal weathering
• D. Physical weathering

Answer: (B)

The correct answer is the type of weathering that is specifically characterized by the alteration of minerals in rocks through chemical processes. Chemical weathering involves reactions with water, acids, oxygen, and other chemical agents that can lead to the breakdown of minerals in rocks and, ultimately, their transformation into new minerals or soluble compounds. This process can significantly affect the physical and chemical properties of the rocks and soil, influencing factors like soil fertility and the environment.

For instance, when minerals such as feldspar react with carbonic acid in rainwater, they can be altered to clay minerals through a series of chemical reactions. This process is key to soil development and nutrient availability for plants. Unlike mechanical, thermal, or physical weathering, which primarily focus on the physical breakdown of rocks without altering their chemical composition, chemical weathering directly changes the mineral content and structure of the rocks involved.