Why fine grained rock weather faster?

Fine-grained rocks weather faster than coarse-grained rocks primarily due to their larger surface area relative to their volume. This increased surface area allows for more extensive exposure to weathering agents such as water, air, and biological activity. Additionally, fine-grained rocks often have more easily accessible minerals that can be chemically altered or dissolved, further accelerating the weathering process. As a result, fine-grained rocks tend to break down more rapidly than their coarser counterparts.