2, "Fishing Songs" Tang Zhang Sai Sai Shan before the egrets fly, peach blossoms flowing water mandarin fish fat. An old man in the bank, wearing a green bamboo hat raincoat and a green raincoat, braved the wind and rain and fished leisurely. He was fascinated by the beautiful spring scenery and didn't even go home in the rain.
Wind is a natural phenomenon caused by air flow, which is caused by solar radiation heat. Sunlight shines on the earth's surface, causing the surface temperature to rise, and the surface air to expand and become lighter and lighter. After the hot air rises, the cold air with low temperature flows in horizontally, and the rising air falls down because it gradually cools and becomes heavier. Because the surface temperature is high, it will heat up the air, and this airflow will produce wind.
Scientifically speaking, wind often refers to the horizontal motion component of air, including direction and size, that is, wind direction and wind speed; But for flight, it also includes vertical motion components, so-called vertical or ascending and descending airflow. Strong winds can move objects and their directions (mass of matter). The wind is very fast.