by Q. Which of the following statements with reference to Salt Weathering is/are correct?
UPSC CDS Examination (I) 2025 – General Knowledge
Select the answer using the code given below:
(a) 1 only
(b) 2 only
(c) Вoth 1 and 2
(d) Neither 1 nor 2
Answer: (c) Вoth 1 and 2
Explanation:
Salt weathering occurs when salts in solution (usually from seawater or groundwater) enter the pores and cracks of rocks. When the water evaporates, salts crystallize and expand, exerting stress on the rock, causing it to break. There are several processes like crystallization, hydration, and thermal expansion, but crystallization is the most destructive because of the pressure it exerts.
Statement 1: Correct
Salt crystallization indeed is the most effective form of salt weathering, especially in porous rocks, because the growth of salt crystals generates significant stress.
Statement 2: Correct
- Sedimentary rocks (like sandstone or limestone) have more porosity and interconnected pores, which allow salts to penetrate and crystallize more effectively.
- Igneous rocks (like granite) are generally less porous and more compact, so salt crystal growth has less impact.
Answer: (c) Вoth 1 and 2
