The primary function of mechanical weathering in geology is to break down rocks into smaller particles without altering their chemical composition. This process is driven by physical forces such as temperature fluctuations, freeze-thaw cycles, and erosion caused by wind or water. Mechanical weathering contributes to the formation of soil and aggregates, which are fundamental for ecosystems and for nutrient cycling. By facilitating the gradual degradation of rock structures, mechanical weathering plays a critical role in the geological and environmental processes that shape landscapes and influence biodiversity.