The walls of the northern dwellings are tight and heavy, the walls of the south are light and thin, why

Reason

This is because the north is close to the source of winter winds, so the winter winds are very large; coupled with the high latitude of the north, the winter temperature is low; the northern climate is dry, more sandstorms weather. So the walls are much thicker to protect against the cold and wind and sand.

The southern climate is humid, low latitude, high temperature. The walls are light and thin to dissipate heat.

Expanded:

There are also differences between northern and southern houses. In the north, houses have flat roofs because the north is dry and flat roofs are good for drying grains; in the south, roofs are mostly tiled and pitched because the south is rainy and pitched roofs are good for draining water, and tiled roofs are ventilated to dissipate heat.

The climate of a place has a great influence on the living environment. For example, the Mongolian people more nomadic, yurts are easy to migrate; Yan'an people use the loess of the uprightness of the construction of the kiln to live; Yunnan Dai hot and humid climate, so the house is mostly high bamboo, one can heat, two can defend those snakes, rats and insects and other things.