The weather is particularly hot, and the fluctuation of the scenery becomes blurred. What is the phenomenon?

This is a very common phenomenon in nature. Due to the high temperature, the evaporation of water in ground objects and soil is intensified. In hot weather, under the irradiation of strong sunlight, the hot airflow rises and refracts. Therefore, when the weather is particularly hot, the distant scenery will fluctuate in the air and become blurred, just like water ripples.