Which one of the following is an example of Salt-Crystal growth ?

Chemical weathering

Physical weathering

Biological weathering

Bio-chemical weathering

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This question was previously asked in

UPSC NDA-1 – 2019

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Salt-crystal growth is a form of mechanical weathering (also known as physical weathering) where salts crystallize within the pores and cracks of rocks.

– Salt crystallization occurs when saline water evaporates, leaving salt crystals behind.
– As these crystals grow, they exert pressure on the surrounding rock, causing it to disintegrate.
– This process is particularly effective in arid and semi-arid regions where evaporation rates are high, and in coastal areas exposed to salt spray.

Physical weathering breaks down rocks into smaller pieces without changing their chemical composition. Other examples of physical weathering include frost wedging, thermal expansion and contraction, exfoliation, and abrasion. Chemical weathering involves chemical changes in the rock composition (e.g., dissolution, oxidation, hydrolysis). Biological weathering involves the action of living organisms. Bio-chemical weathering is a combination of biological and chemical processes.

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