The process of weathering and erosion, where rainwater and friction from sand smoothen and polish rocks, was not known 1400 years ago. However, this phenomenon is referenced in the Quran long before it was understood by modern science.

Key points: - The verse uses the metaphor of a rock being struck by a downpour, causing it to become smooth. - The process of weathering and erosion, which involves the smoothing of rocks through friction with water and sand, is alluded to here.

- What is Weathering? Weathering is the process through which rocks are broken down due to mechanical forces like friction, or chemical processes. Rainwater, along with wind and sand, plays a significant role in eroding rocks and smoothing their surfaces. - What is Erosion? Erosion refers to the movement of these weathered rock fragments by agents such as water, wind, and ice. Over time, these processes sculpt the landscape, creating everything from smooth cliffs to finely polished stones. - Fracture and Smoothness of Rocks: The interaction between moving water and stationary rocks causes abrasion, which smoothens the surfaces of the rocks. This is the basis of natural erosion, visible in rock formations around rivers, beaches, and deserts.

The Quran’s description of a rock being smoothed by rainwater and sand accurately reflects the process of weathering and erosion, which modern geology has only recently uncovered. The Quranic verse stands as a remarkable reference to natural processes that were not understood at the time, raising questions about the source of this knowledge.