Which type of weathering alters the physical appearance of rocks and is common in cold environments?

• A. Mechanical Weathering
• B. Weathering
• C. Erosion
• D. Frost Wedging

Answer: (A)

Mechanical weathering is the physical breakup of rocks into smaller pieces without changing their mineral composition. This type of weathering alters a rock’s appearance, creating cracks, fragments, and rough surfaces. In cold environments, water in cracks expands when it freezes, pushing the rock apart and causing it to fracture—frost wedging is a classic example of this process. The broader category of mechanical weathering fits best here because it covers the general physical changes that change how rocks look, whereas weathering is too broad (including chemical changes), erosion is the removal and transport of material, and frost wedging is a specific mechanism rather than the general type.