Maharashtra State PSC Model Paper 2

The correct answer is the Expansion of salts due to temperature changes and crystallization is referred to as physical weathering. 

• Expansion of solids due to temperature change, hydration, and crystallization is referred to as physical weathering. Hence, statement 1 is correct. 
• Removal of rocks because of continued erosion results in vertical pressure release which disintegrates the rock masses. 
• Fractures tend to develop and massive sheets or exfoliation slabs of rocks are formed.
• The reason behind exhalation sheets is unloading and pressure release. 
• Biological weathering is the removal of minerals from the environment due to the growth or action of organisms. Hence, statement 2 is incorrect.
• Weathering processes as a result of the solution, carbonation, hydration oxidation, and reduction comes under chemical weathering.