What is the difference between the roof structure in the north and the roof structure in the south? Why?

Houses in the north are thicker in terms of cold protection, while houses in the south are thinner in terms of moisture protection. Generally, the first floor is empty, or used as a living room and garage. Houses in the north generally have spires, while those in the south have flat roofs. In addition, according to the different levels of earthquake disasters, the seismic design level is also different!