Hello,Mrs.Ketlo
It seems that your questions cannot be answered with a specific Great Wall study. Here is waht i have: the changing of the seasons do effect the structure of the Great Wall. As the walls were constructed with different materials, they were destoryed at different rate. The Great Wall starts from Hushan in Liaoning in the east and ends at Jiayuguan Pass in Gansu in the west, via the nine provinces or cities in northern China, including Liaoning, Hebei, Beijing, Tianjin, Shanxi, Shaanxi, Inner Mongolia, Ningxia and Gansu. You guess, how long it would take to finish them all, 8,851.8 km long. As Great Wall of China has numerous sections, it is hard to tell how many times it was rebuilt or repaired in the last ten years.