Question 19

Chemical weathering

Chemical weathering is defined as the breakdown of rocks or soil due to compositional changes, which often involves chemical reactions that alter the minerals within the rocks.

A) Deposition

Deposition refers to the process by which sediments are laid down in new locations after being transported by wind, water, or ice. It does not involve the breakdown of rocks or soil through compositional changes, making this option incorrect.

B) Erosion

Erosion is the process through which soil and rock are removed from one location and transported to another, often by natural forces such as water, wind, or ice. While erosion involves movement, it does not specifically pertain to the chemical breakdown of materials, thus it is not the correct answer.

C) Chemical weathering

Chemical weathering is the correct term for the breakdown of rocks or soil as a result of compositional changes. It involves chemical reactions, such as oxidation or hydrolysis, that transform minerals and lead to the disintegration of rock structures.

D) Physical weathering

Physical weathering, also known as mechanical weathering, involves the physical breakdown of rocks into smaller pieces without changing their chemical composition. This option is incorrect because it does not address the chemical changes that define the process in question.

Conclusion

Chemical weathering is definitively the correct answer as it specifically involves the breakdown of rocks or soil through compositional changes. In contrast, deposition, erosion, and physical weathering do not encapsulate this process, focusing instead on movement or physical alteration without chemical transformation.