Block Disintegration: When the difference between the day and night temperature is large, rocks expand and contract. They expand during the day, when the temperature is high and contract during the night when the temperature is extremely low. This results in the splitting of rocks. This happens in regions where there is a great variation in the day and the night temperatures. Example in the deserts. But....... Granular Disintegration: When the agents of weathering, reduce rocks made up of different minerals to small pieces and fragments, it is called granular disintegration.