The alternate heating and cooling of rocks will result in

The alternate heating and cooling of rocks can cause the rocks to expand and contract. When rocks are heated, they expand, and when they cool down, they contract. If this process of heating and cooling is repeated several times, it can cause the rocks to become stressed, which can lead to the development of cracks and fractures in the rock. The repeated heating and cooling of rocks can cause them to break down into smaller pieces through a process known as fragmentation. The cracks and fractures in the rocks can widen and deepen over time, eventually breaking the rock into smaller pieces. Therefore, the correct answer is "fragmentation."