Which is NOT a type of physical weathering?

Question

BlackTom AI · Accepted Answer

Hydrolysis is a chemical weathering process that alters the mineral’s chemical composition by reaction with water and acids, so it is NOT a type of physical weathering.

1) Relevant knowledge points and concepts
- Physical (mechanical) weathering breaks rocks into smaller pieces without changing their mineral chemistry. Common mechanisms: freeze-thaw (frost wedging), salt crystallization, and pressure-release/exfoliation.
- Chemical weathering changes the minerals’ composition by chemical reactions (e.g., hydrolysis, oxidation, dissolution, carbonation). Hydrolysis commonly converts feldspars into clay minerals and releases soluble ions.

2) Step-by-step reasoning
- Identify each option and classify it:
  a) Frost wedging: liquid water enters cracks, freezes, expands (~9% volume increase) and pries rock apart. This is mechanical fracturing (physical).
  b) Salt weathering: saline solution enters pores; as water evaporates salts crystallize and exert outward pressure, breaking rock grains. This is mechanical stress at grain scale (physical).
  c) Hydrolysis: H2O (and H+ from acids) chemically reacts with mineral structures (e.g., feldspar), producing new minerals (clays) and dissolved ions. This changes mineral chemistry (chemical).
  d) Exfoliation (pressure-release): removal of overburden allows rock to expand and peel off in sheets—mechanical unloading (physical).

3) Intermediate steps / examples
- Example hydrolysis reaction (simplified): feldspar + H2O + H+ → clay mineral + dissolved silica + cations. This demonstrates formation of new mineral phases and soluble products, hallmark of chemical weathering.
- Frost wedging and salt crystallization involve physical forces (expansion, crystallization pressure) without altering mineral formulas.

4) Why the correct answer is correct
- Hydrolysis alters chemical bonds and produces new minerals; it is a chemical process, not mechanical. Therefore it is not a type of physical weathering.

5) Why other options are incorrect
- Frost wedging, salt weathering, and exfoliation all mechanically break rock into smaller pieces without changing mineral chemistry, so they are correctly classified as physical weathering.

6) Conclusion
- The correct choice is Hydrolysis, which matches the provided answer.

Which is NOT a type of physical weathering?单项选择题

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