Key words: The mountains and rivers in China are generally east-west, alternating with mountains and rivers.
1, China is located in the northern hemisphere. The sun rises in the east, passes through the south and finally sets in the west. Sunny in the south and sunny (sunny) in the north. The sunshine in the south of the mountain is more abundant than that in the north of the mountain, so the south of the mountain is called Yang and the north of the mountain is called Yin.
2. The topography of China is high in the northwest and gradually low in the southeast. When the river flows, it tends to the southeast, and the south bank of the river is vulnerable to the impact and erosion of the river, forming a situation that the south is wet and the north is dry, so the water in the north is sunny and the water in the south is cloudy.