ASBOG Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What process describes the breakdown of rocks by chemical reactions?

Mechanical weathering

Chemical weathering

The breakdown of rocks by chemical reactions is specifically referred to as chemical weathering. This process involves the alteration of the mineral composition of rocks through chemical reactions, such as hydrolysis, oxidation, and carbonation. During chemical weathering, elements within the minerals react with water, acids, or gases in the atmosphere, leading to the formation of new minerals and soluble substances. This contrasts with other weathering processes, which either involve physical forces (such as mechanical weathering and physical erosion) or biological agents (as seen in biological weathering). Therefore, the term "chemical weathering" is the most accurate descriptor for this specific breakdown process, highlighting the fundamental role of chemical reactions in rock alteration.

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Physical erosion

Biological weathering

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