What is the reason for the yellow weather?
The sky sometimes turns yellow before heavy rain. Some people will think that the strong wind before the rain brought the dust on the ground into the clouds, causing the sky to turn yellow. This statement also has some truth. After all, clouds are not spotless. On the contrary, the small water droplets gathered in the sky play the role of activated carbon, absorbing the dust particles floating in the high sky, and turning yellow when they gather too much.
Another reason is the light, because the clouds in the sky are very low on rainy days, and the light is easy to spread. The bare land is yellow because loess does not absorb the yellow light in the sun. At this time, the yellow light reflected by the yellow land and the strong light source on the ground will make the clouds in the sky reflect yellow because of these yellow lights, and there are some very slight influencing factors. If there is thunder, nitrogen in the air reacts with oxygen under lightning to generate nitric oxide, and nitric oxide reacts with oxygen in the air to generate nitrogen dioxide, because nitrogen dioxide is brownish red, but it looks yellow when there is only a small amount of nitrogen dioxide.
But these are all natural phenomena when it rains. But there is another reason why the sky turns yellow, and that is sandstorm. Some people will say that there is no sandstorm on TV, and even the surrounding air is fresh. In fact, sandstorms are not that simple. A large part of sandstorms are high-altitude dust. According to the observation, when a strong sandstorm is formed, if the wind speed reaches 30m per second (1 1 wind), coarse sand (0.5~ 1.0) fine sand (0.1.25 ~ 0.25mm in diameter) will fly 2m high, and silt (.
Through the yellow sky of sandstorm
Why is the sky yellow and the earthquake has nothing to do with it?
As far as the current science and technology are concerned, there is no technology to predict earthquakes for a long time in advance, and there is no rigorous scientific basis to predict earthquakes by relying on various wonders and visions. Although in some cases, dogs and other animals will be anxious in advance, this behavior is very disturbing. Many times they will behave like this as long as they are in great danger, which is a great coincidence. If an earthquake happens to turn yellow, say it's an earthquake.
Seismic waves propagating inside the earth are called body waves, which are divided into longitudinal waves and shear waves. The waves with the same vibration direction and propagation direction are longitudinal waves (P waves), and the longitudinal waves from underground make the ground bump up and down. The wave whose vibration direction is perpendicular to the propagation direction is shear wave (S wave), and the shear wave from underground can cause horizontal ground vibration. Because the propagation speed of longitudinal wave in the earth is faster than that of shear wave, in an earthquake, longitudinal wave always reaches the surface first, while shear wave always lags behind. Seismic waves propagating along the ground are called surface waves, which are divided into Loew waves and Rayleigh waves. The biggest feature of these two waves is that they also spread on the ground and will not leave the ground to affect the high altitude.